#include <iostream>

int main()
{
    int W,D;
    double N;
    std::cin >> W;
    std::cin >> D;
    while(D > 1)
    {
        N = W;
        W -= (int)((N/(double)D)/(double)D);
        D--;
    }
    std::cout << W << std::endl;
    
    return 0;
}