X04437

#include <iostream>
#include <cmath>
using namespace std;

double dist_or(double x, double y) {

  double r;
  r = sqrt((x*x)+(y*y));
  return r;
}

int main() {

  double a, b, d;
  cin >> a >> b;

  d = dist_or(a,b);
  cout << d << endl;

}