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