#include <bits/stdc++.h>
using namespace std;
void solve() {
  unsigned long long a, b, c;
  cin >> a >> b >> c;
  unsigned long long left = ((a + b - c)) * ((a + b - c));
  unsigned long long right = 4 * a * b;
  if (left > right) {
    cout << "Yes\n";
  } else {
    cout << "No\n";
  }
}
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  solve();
  return 0;
}
