#include<bits/stdc++.h>
using namespace std;
#define NUM 10000
int num[NUM];
int main(){
    long long W, D; cin >> W >> D;
    long long work = 0;
    for(;;){
        work = W / (D * D);
        D -= 1;
        W -= work;
        if(W <= 0) break;
    }
    cout << work << endl;
    return 0;
}