#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  long long a, b, c;
  cin >> a >> b >> c;
  long long x = a + b + sqrt(a * b) * 2;
  if (x < c)
    cout << "Yes\n";
  else
    cout << "No\n";
}
