#include <bits/stdc++.h>
using namespace std;
const int maxn = 10000 + 10;
long long sqr(long long a) { return a * a; }
int main() {
  long long a, b, c;
  cin >> a >> b >> c;
  if (a < c && b < c && (c - a - b < 0 || sqr(a + b - c) < 4 * a * b)) {
    cout << "Yes\n";
  } else {
    cout << "No\n";
  }
  getchar();
  getchar();
  return 0;
}
