#include <bits/stdc++.h>
using namespace std;

int main() {
  long long  a,b,c;
  cin >> a>> b>> c;
  if(c-a-b<0) cout << "No";
  else if ((c-a-b)*(c-a-b)-4*a*b > 0) cout << "Yes";
  else cout << "No";
}
