#include <bits/stdc++.h>
using namespace std;
signed main() {
  long long int a, b, c;
  cin >> a >> b >> c;
  if (a == b) {
    if (c > 4 * a) {
      cout << "Yes" << endl;
    } else {
      cout << "No" << endl;
    }
    return 0;
  }
  if (c > 2 * (a + b)) {
    cout << "Yes" << endl;
  } else {
    cout << "No" << endl;
  }
  return 0;
}
