#include <bits/stdc++.h>
int main() {
  long long a{}, b{}, c{};
  std::cin >> a >> b >> c;
  const auto r = c - a - b;
  if (r <= 0) {
    std::cout << "No" << std::endl;
    return 0;
  }
  const auto l2 = 4 * a * b;
  const auto r2 = r * r;
  std::cout << ((l2 < r2) ? "Yes" : "No") << std::endl;
  return 0;
}
