#include <bits/stdc++.h>
using namespace std;
int main() {
  double a, b, c;
  double t;
  long long int sum = 0;
  cin >> a >> b >> c;
  t = 2 * (sqrt(a * b));
  sum = 2 * (a + b);
  if ((sum < c && a == b) || (sum <= c && a != b) || (c - t) > (a + b)) {
    cout << "Yes";
  } else {
    cout << "No";
  }
}
