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