#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
#define pb push_back
#define mp make_pair
#define rep(i,n) for(int i=0;i<(n);++i)
const int mod=1000000007;

int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);
	ll w,d;cin >> w >> d;
	ll ans=w,k=d;
	rep(i,d-1){
		ans-=w/(k*k);
		w=ans;
		k--;
	}
	cout << ans << endl;
}