#include<bits/stdc++.h>
using namespace std;
int main()
{
	int a,b;
	cin>>a>>b;
	cout<<a-b;
	return 0;
 } 

#include using namespace std; int main() { int a,b,s; scanf("%d %d",&a,&b); s=a-b; printf("%d\n",s); return 0; }