#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using Pi = pair<int, int>;
using Pl = pair<ll, ll>;
int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  ll a, b, c;
  cin >> a >> b >> c;
  ll d = (c - a - b);
  if (d > 0 && d * d < 4 * a * b)
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
}
