#include <bits/stdc++.h>
using namespace std;
int main() {
  long long a, b, c;
  long long cab, cab_sq, ab4;
  cin >> a >> b >> c;
  cab = (c - a - b);
  cab_sq = cab * cab;
  ab4 = 4 * a * b;
  if (cab > 0 && ab4 < cab_sq) {
    cout << "Yes"
         << "\n";
  } else {
    cout << "No"
         << "\n";
  }
}
