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