#include <bits/stdc++.h>
using namespace std;
using ld = long double;

int main(void) {
    int a, b; cin >> a >> b; if (a < b) swap(a, b);
    assert(1 <= a && a <= 1000);
    assert(1 <= b && b <= 1000);
    cout << fixed << setprecision(40) << sqrtl((ld)a * (ld)a + ((ld)a == (ld)b ? 1.0l : -1.0l) * (ld)b * (ld)b) << endl;
    return 0;
}