#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b, x;
  cin >> a >> b >> x;
  if ((a + b) >= x || a >= x || b >= x) {
    cout << "yes";
  }
  if ((a + b) < x) {
    cout << "No";
  }
  return 0;
}
