#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  double a, b, c;
  cin >> a >> b >> c;
  c = c - a - b;
  if (4 * a * b < (c * c) && c > 0)
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
  return 0;
}
