#include <bits/stdc++.h>
#define fast ios::sync_with_stdio(false)
#define ct cin.tie(nullptr)
#define ll long long
#define nl '\n'
#define newline cout<<'\n'
#define yes cout<<"YES"<<'\n'
#define no cout<<"NO"<<'\n'
using namespace std;
void solve()
{


}
int main()
{
    fast;
    ct;
   //int t;
    //cin>>t;
    //while(t--)

        int n , k;
        cin>>n>>k;
        cout<<n-k<<nl;

}