#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include<bits/stdtr1c++.h>
#define int long long
using namespace std;
constexpr int mod=998244353;
signed main(){
    int a,b;
    cin>>a>>b;
    cout<<a-b<<endl;
}