#include <bits/stdc++.h>
using namespace std;
template <typename T>
T gcd(T a, T b) {
  if (b == 0) return a;
  return gcd(b, a % b);
}
int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  long long a, b, c;
  cin >> a >> b >> c;
  if (c - a - b >= 0 && pow((double)(c - a - b), 2) > 4 * a * b)
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
}
