#include <bits/stdc++.h>
using namespace std;
long a, b, c;
int main() {
  cin >> a >> b >> c;
  if (4 * a * b < pow(c - a - b, 2) && c - a - b > 0) {
    cout << "Yes" << endl;
    return 0;
  }
  cout << "No" << endl;
}
