#include <bits/stdc++.h>
using namespace std;
int main() {
  int A, B, C;
  cin >> A >> B >> C;
  if (A >= 1 && B >= 1 && C >= 1) {
    if (A + B >= C)
      cout << "yes" << endl;
    else
      cout << "No" << endl;
  }
}
