4function.cpp

/*Input Format

Input will contain four integers -a,b,c,d  , one per line.

Output Format

Return the greatest of the four integers.
PS: I/O will be automatically handled.

Sample Input

3
4
6
5
Sample Output

6*/

#include <iostream>
#include <cstdio>
using namespace std;

/*
Add `int max_of_four(int a, int b, int c, int d)` here.
*/ 
int max_of_four(int a, int b, int c, int d){
if(a > b){
    if(a > c){
        if(a>d)return a;
        else return d;
    }
    else {
        if(c > d)return c;
        else return d;
    }
}
else{
    if(b > c){
        if(b > d)return b;
        else return d;
    }
    else{
        if(c > d)return c;
        else return d;
    }
}
}


int main() {
    int a, b, c, d;
    scanf("%d %d %d %d", &a, &b, &c, &d);
    int ans = max_of_four(a, b, c, d);
    printf("%d", ans);
    
    return 0;
}