#include <iostream>

int main()
{
    int N = 0;
    int K = 0;
    std::cin >> N;
    std::cin >> K;
    int mustdmg = 0;
    mustdmg = N / (K + 1) + 1;
    if(N % (K + 1) == 0)
    {
        mustdmg++;
    }
    std::cout << mustdmg;
    
    return 0;
}