#include<bits/stdc++.h>

using namespace std;
using ll=long long;
#define rep2(i, a, n) for(int i = (a); i < (n); i++)
#define rep(i, n) rep2(i,0,n)

int main(){
  cin.tie(nullptr);ios_base::sync_with_stdio(false);
  int w,d;
  cin>>w>>d;
  ll hoge;
  int shake=d;
  rep(i,d){
    hoge=w/(shake*shake);
    //cout<<w<<" "<<w/(shake*shake)<<" "<<hoge<<endl;
    w-=hoge;
    shake--;
  }
  cout<<(hoge>0?hoge:0)<<endl;
}