#include <bits/stdc++.h>
using namespace std;
int main() {
  long int a, b, c, t;
  cin >> a >> b >> c;
  t = a * b - (c - a - b) * (c - a - b);
  if ((t < 0) && (c - a - b > 0)) {
    cout << "Yes" << endl;
  } else {
    cout << "No" << endl;
  }
  return 0;
}
