#include <bits/stdc++.h>

using namespace std;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    unsigned long long a, b; cin >> a >> b;
    assert(1 <= a && a <= 1000000000);
    assert(1 <= b && b <= 1000000000);

    unsigned long long ok = 65000, ng = 0;
    while(ok - ng > 1){
        unsigned long long mid = (ok + ng) / 2;

        if(4ULL * a * b < (mid * mid - a - b) * (mid * mid - a - b)){
            ok = mid;
        }else{
            ng = mid;
        }
    }
    cout << ok << endl;
}