#include<iostream>
#include<stdio.h>
#include<math.h>

using namespace std;

int main(){
    int w, d;
    cin>> w>> d;

    while(d!=1){
        w = w - (int)floor((double)w/d/d);
        d -= 1;
    }

    cout<< w<< endl;
    return 0;
}