#include <bits/stdc++.h>
using namespace std;
const int INF = 1e9 + 7;
const int MOD = 1e9 + 7;
int main() {
  int A, B, C;
  cin >> A >> B >> C;
  cout << (A + B * 2 >= C ? "Yes" : "No") << endl;
  return 0;
}
