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