#include <bits/stdc++.h>
using namespace std;
int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  int a, b, c;
  string result;
  cin >> a >> b >> c;
  if (a + b * 2 >= c) {
    result = "Yes";
  } else {
    result = "No";
  }
  cout << result << endl;
  return 0;
}
