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