#include <bits/stdc++.h>
using namespace std;
int main() {
  long double a, b, c;
  cin >> a >> b >> c;
  long double a1 = sqrtl(a);
  long double b1 = sqrtl(b);
  if (c > (a + b)) {
    c = c - (a + b);
    long double che = 2 * (a1 * b1);
    if (c > (che)) {
      cout << "Yes\n";
    } else {
      cout << "No\n";
    }
  } else {
    cout << "No\n";
  }
  return 0;
}
