#include <bits/stdc++.h>
using namespace std;
int main() {
  long long a, b, c;
  cin >> a >> b >> c;
  string out = "No";
  long long d = c - a - b;
  if (d > 0 && pow(d, 2) > 4 * a * b) out = "Yes";
  cout << out << endl;
  return 0;
}
