#include <bits/stdc++.h>
using namespace std;
int x,y;
int main()
{
cin>>x>>y;
cout<<x-y;
Return 0;
}
program hinh_chu_nhat;
uses crt;
var x,y:integer;
begin
clrscr;
write('nhap gia tri cua x: ');readln(x);
write('nhap gia tri cua y: ');readln(y);
writeln('ket qua la: ',x-y);
readln;
end.