#include<bits/stdc++.h>
using namespace std;

int main() {
    double xp, yp; cin >> xp >> yp;
    double ans = sqrt(xp * xp + yp * yp) * 2;
    if(xp == yp){
        cout << ans << endl;        
    }else{
        cout << ans + 1 << endl;
    }
}