#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main() {
  cin.tie(nullptr);
  ios_base::sync_with_stdio(false);
  cout << fixed << setprecision(15);
  int a, b, c;
  cin >> a >> b >> c;
  a + b * 2 >= c ? cout << "Yes" << endl : cout << "No" << endl;
}
