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

int main(){
    long long N,K,ans;
    cin >> N >> K;

    ans=N/(K+1);
    if(K==1) ans++;
    else if(N%(K+1)==0) ans++;
    else ans+=N%(K+1)%K;

    cout << ans << endl;

    return 0;
}