diff --git a/lab4/main.c b/lab4/main.c
new file mode 100644
index 0000000..92c2927
--- /dev/null
+++ b/lab4/main.c
@@ -0,0 +1,232 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <locale.h>
+
+typedef struct tag_header{
+    unsigned char id[3];
+    unsigned char version;
+    unsigned char subversion;
+    unsigned char flags;
+    unsigned char size[4];
+} tag_header;
+
+typedef struct frame_header{
+    unsigned char id[4];
+    unsigned char size[4];
+    unsigned char flags[2];
+    unsigned char a;
+} frame_header;
+
+int bytes_to_int(unsigned char *tmp){
+    return (int)(tmp[0] << 24 | tmp[1] << 16 | tmp[2] << 8 | tmp[3]);
+}
+
+int check_on_number_of_arguments(int argc)
+{
+    if (argc < 3)
+    {
+        printf("Error, not enough arguments");
+        return -1;
+    }
+    else if (argc > 4)
+    {
+        printf("Error, too much arguments");
+        return -2;
+    }
+    else {
+        return 0;
+    }
+}
+
+char *get_argument(char *argv, char *arg){
+    arg = strtok(argv, "=");
+    arg = strtok(NULL, "=");
+    return arg;
+}
+
+void show(char *file_path){
+    FILE *file = fopen(file_path, "rb");
+    if(file == NULL){
+        printf("Error, cannot open the file\n");
+        return;
+    }
+    fseek(file, 0, SEEK_SET);
+    tag_header tag_header;
+
+    fread(&tag_header, 10 ,sizeof(char), file);
+    char header_id[3];
+    for(int i = 0; i < 3; i++){
+        header_id[i] = tag_header.id[i];
+    }
+    header_id[3] = '\0';
+    if(strcmp(header_id, "ID3") != 0){
+        printf("Error, not id3 format");
+        return;
+    }
+    unsigned int file_size = bytes_to_int(tag_header.size);
+
+    while(ftell(file) < file_size){
+        frame_header frame_header;
+        fread(&frame_header, 11, sizeof(char), file);
+        unsigned int frame_size = bytes_to_int(frame_header.size) - 1;
+        printf("%s ", frame_header.id);
+        char *frame_content = malloc((frame_size+1)*sizeof(char));
+        fread(frame_content, frame_size, sizeof(char), file);
+        frame_content[frame_size] = '\0';
+        printf("%s\n", frame_content);
+        free(frame_content);
+    }
+}
+
+void get(char *file_path, char *prop_name){
+    FILE *file = fopen(file_path, "rb");
+    if(file == NULL){
+        printf("Error, cannot open the file\n");
+        return;
+    }
+    fseek(file,0,SEEK_SET);
+    tag_header tag_header;
+    fread(&tag_header, 10, sizeof(char), file);
+    char header_id[3];
+    for(int i = 0; i < 3; i++){
+        header_id[i] = tag_header.id[i];
+    }
+    header_id[3] = '\0';
+    if(strcmp(header_id, "ID3") != 0){
+        printf("Error, not id3 format");
+        return;
+    }
+
+    unsigned int file_size = bytes_to_int(tag_header.size);
+
+    while(ftell(file) < file_size){
+        frame_header frame_header;
+        fread(&frame_header, 11, sizeof(char), file);
+        unsigned int frame_size = bytes_to_int(frame_header.size) - 1;
+        char frame_name[5];
+        for(int i = 0; i < 4; i++){
+            frame_name[i] = frame_header.id[i];
+        }
+        frame_name[5] = '\0';
+
+        char *frame_content = malloc((frame_size+1)*sizeof(char));
+        fread(frame_content, frame_size, sizeof(char), file);
+        frame_content[frame_size] = '\0';
+
+        if(strcmp(frame_name, prop_name) == 0){
+            printf("%s", frame_content);
+        }
+
+        free(frame_content);
+    }
+}
+
+void set(char *file_path, char *prop_name, char *prop_value){
+    FILE *file = fopen(file_path, "rb");
+    if(file == NULL){
+        printf("Error, cannot open the file\n");
+        return;
+    }
+    fseek(file,0,SEEK_SET);
+    tag_header tag_header;
+    fread(&tag_header, 10, sizeof(char), file);
+    char header_id[3];
+    for(int i = 0; i < 3; i++){
+        header_id[i] = tag_header.id[i];
+    }
+    header_id[3] = '\0';
+    if(strcmp(header_id, "ID3") != 0){
+        printf("Error, not id3 format");
+        return;
+    }
+
+    unsigned int file_size = bytes_to_int(tag_header.size);
+    
+    
+}
+
+int main(int argc, char **argv)
+{
+    setlocale(LC_ALL, "Russian");
+
+    printf("hello \n");
+    char *file_path = NULL;
+    int show_flag = 0;
+    int get_flag = 0;
+    char *prop_name = NULL;
+    char *prop_value = NULL;
+    int set_flag = 0;
+
+
+    if(check_on_number_of_arguments(argc) != 0){
+        return - 1;
+    }
+
+    for(int i = 1; i < argc; i++){
+        if(strncmp("--filepath=", argv[i], 11) == 0){
+            file_path = get_argument(argv[i], file_path);
+            if(file_path == NULL){
+                printf("Error, wrong format\n");
+                return -1;
+            }
+            printf("%s\n", file_path);
+        }
+        else if(strncmp("--get=", argv[i], 6) == 0){
+            printf("get= ");
+            get_flag = 1;
+            prop_name = get_argument(argv[i], prop_name);
+            if(prop_name == NULL){
+                printf("Error, worng format\n");
+                return -1;
+            }
+            printf("%s\n", prop_name);
+        }
+        else if(strncmp("--show", argv[i], 6) == 0){
+            printf("show\n");
+            show_flag = 1;
+        }
+        else if(strncmp("--set=", argv[i], 6) == 0){
+            printf("set= ");
+            set_flag = 1;
+            prop_name = get_argument(argv[i], prop_name);
+            if(prop_name == NULL){
+                printf("Error, wrong format\n");
+                return -1;
+            }
+            printf("%s\n", prop_name);
+            i++;
+            if(i >= argc){
+                printf("Error, worng format\n");
+                return -1;
+            }
+            if(strncmp("--value=", argv[i], 8) == 0){
+                printf("value= ");
+                prop_value = get_argument(argv[i], prop_value);
+                if(prop_value == NULL){
+                    printf("Error, wrong format\n");
+                    return -1;
+                }
+                printf("%s\n", prop_value);
+            }
+            else{
+                printf("Error, wrong format\n");
+                return -1;
+            }
+        }
+    }
+
+    if(show_flag){
+        show(file_path);
+        return 0;
+    }
+    if(get_flag){
+        get(file_path, prop_name);
+        return 0;
+    }
+    if(set_flag){
+        set(file_path, prop_name, prop_value);
+        return 0;
+    }
+    return 0;
+}
\ No newline at end of file