#include <bits/stdc++.h>
using namespace std;
int main() {
  double a, b, c;
  cin >> a >> b >> c;
  double A = sqrt(a);
  double B = sqrt(b);
  double C = sqrt(c);
  if (A + B < C)
    cout << "Ys" << endl;
  else
    cout << "No" << endl;
  return 0;
}
