diff --git a/2018/YuliyaBondareva/1/pascal_tree.rb b/2018/YuliyaBondareva/1/pascal_tree.rb
new file mode 100644
index 000000000..bae0edc29
--- /dev/null
+++ b/2018/YuliyaBondareva/1/pascal_tree.rb
@@ -0,0 +1,44 @@
+require 'terminfo'
+
+def tree(number, base_number)
+  width = TermInfo.screen_size
+  puts 'Pascal triangle'.center(width[1].to_i)
+  number.times do |index|
+    trn = [base_number]
+    temp = base_number
+    s = 1
+    branch = [' /']
+    index.times do
+      temp = ((temp * (index - s + 1)) / s)
+      trn.push temp
+      s += 1
+      branch.push ' /'
+    end
+    arr_to_str = trn.join('   ')
+    str_end = branch.join('  \\')
+    puts "#{index + 1}:" + ' ' + arr_to_str.center(width[1].to_i)
+    if index != (number - 1)
+      puts '  ' + "#{str_end}  \\".center(width[1].to_i)
+    end
+  end
+end
+
+puts 'Depth?'
+number = gets.chomp
+base_number = ENV['BASE']
+if number.to_i <= 0
+  loop do
+    puts 'depth must be positive. '
+    puts 'Depth?'
+    number = gets.chomp
+    break if number.to_i > 0
+  end
+elsif base_number.to_i <= 0
+  loop do
+    puts 'BASE must be positive. '
+    puts 'BASE?'
+    base_number = gets.chomp
+    break if base_number.to_i > 0
+  end
+end
+tree(number.to_i, base_number.to_i)