/// Md Abdur Rahman Salman ///

#include<bits/stdc++.h>
using namespace std;

#define endl "\n"
#define bug(x) cout << #x << ": " << x << endl
int32_t main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int n, k; cin >> n >> k;
    cout << n - k << endl;
    return 0;
}