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