#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b, c;
  long long int sum = 0;
  cin >> a >> b >> c;
  sum = 2 * (a + b);
  if ((2 * sum) < (c - a - b) * (c - a - b) && a + b < c) {
    cout << "Yes";
  } else {
    cout << "No";
  }
}
