#include <bits/stdc++.h>
using namespace std;
int main() {
  long double a, b, c;
  cin >> a >> b >> c;
  if (a * 2 + b * 2 - pow((max(a, b) - min(a, b)), 2) < c)
    cout << "Yes\n";
  else
    cout << "No\n";
}
