#include using namespace std; int main() { double a, b; cin >> a >> b; double l, s; if (a > b) { s = b; l = a; } else if (a < b) { s = a; l = b; } else { cout << sqrtf64(2) * a; return 0; } double ans = sqrtf64(pow(l, 2) - pow(s, 2)); cout << ans; }