#include <iostream>
#define ll long long
using namespace std;
ll N,K;
ll s = 1,e,mid,ans;
ll min(ll a, ll b) {
return a>b?b:a;
}
int main() {
cin >> N >> K;
e = K;
while(s<=e) {
mid = (s+e)/2;
int m = 0;
for(int x = 1; x<=N; x++) {
m += min(N, (int)mid/x);
}
if(m < K){
s = mid + 1;
}
else {
ans = mid;
e = mid -1;
}
}
cout << ans;
}