#include <bits/stdc++.h>
using namespace std;
int main(void) {
  double a, b, c;
  cin >> a >> b >> c;
  double r = a + 2 * (double)sqrt(a * b) + b;
  if (r < c) {
    cout << "Yes" << endl;
  } else {
    cout << "No" << endl;
  }
}
