#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define fi first
#define se second
const int N=2e5+1;
int n,q;
ll a[N];

int main(){
	ios::sync_with_stdio(false);cin.tie(0);
	int x,y;cin >> x >> y;cout << x-y << endl;
}