#include <bits/stdc++.h>
using namespace std;
int main() {
  long double a, b, c;
  cin >> a >> b >> c;
  if (c - a - b > 0) {
    if (a * b < (c - a - b) * (c - a - b) / 4.0) {
      cout << "Yes" << endl;
    } else {
      cout << "No" << endl;
    }
  } else {
    cout << "No" << endl;
  }
}
