#include<bits/stdc++.h>
using namespace std;
#define int             long long
#define pb              push_back
#define endl            '\n'
#define ff              first
#define ss              second
#define debug           cout<<"HERE"<<endl
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
void edm()
{
    ios::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr);
    #ifndef ONLINE_JUDGE
    freopen("input.txt","r",stdin);
    freopen("outputtt.txt","w",stdout);
    #endif
}
void solve()
{
    int n,k;cin>>n>>k;
    cout<<n-k<<endl;   
}
int32_t main()
{
    //edm();
    int t = 1;
    // cin>>t;
    for(int i=1;i<=t;i++)
    {
        // cout<<"Case "<<i<<": ";
        solve();
    }
}