#include <bits/stdc++.h>
using namespace std;
int main(void) {
  long long int a, b, c, x, y;
  cin >> a >> b >> c;
  x = 4 * a * b;
  y = (a + b - c) * (a + b - c);
  if (a + b - c > 0) {
    cout << "No" << endl;
    return 0;
  }
  if (x < y) {
    cout << "Yes" << endl;
  } else {
    cout << "No" << endl;
  }
  return 0;
}
