#include <bits/stdc++.h>
using namespace std;
using ll = long long;
constexpr ll MOD = 1000000007;
int main(int argc, char **argv) {
  long double a, b, c;
  cin >> a >> b >> c;
  std::cout << ((a + 2 * sqrt(a) * sqrt(b) + b < c) ? "Yes" : "No")
            << std::endl;
}
