#include <bits/stdc++.h>
using namespace std;
int main() {
  long long a, b, c;
  cin >> a >> b >> c;
  long long r = 0, s = 0;
  r = sqrt(a * b);
  s = a + b + 2 * r;
  if (s < c) {
    cout << "YES" << endl;
  } else if (s >= c) {
    cout << "NO" << endl;
  }
  return 0;
}
