#include <iostream>
using namespace std;
int main(void){
    // Here your code !
    unsigned long long int N,K;
    cin >> N >> K;
    
    if( N <= K ){
        cout << 1 << endl;
        return 0;
    }
    
    if( N/ ((N+K)/(K+1)) > K )
    cout << (N+K)/(K+1)+1 << endl;
    else
    cout << (N+K)/(K+1) << endl;
    
}