#include <bits/stdc++.h>
using namespace std;
int main() {
  long long i, j, k, a, b, c = 0, d, n, m, t = 1, x;
  cin >> n >> d >> x;
  if (n + d <= x)
    cout << "Yes";
  else
    cout << "No";
  return 0;
}
