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