#include <bits/stdc++.h>
using namespace std;
const long long N = 3e6 + 17;
long long a[N], b[N], cnt, ans, lnt, n, m, r1, r0, l1, l0, sum, mx, h, c[N],
    t[N], mn = N, x, y, k;
pair<long long, long long> pr[N];
vector<long long> v, v2;
map<long long, long long> mp;
bool used[N];
char ch[N];
long long prime[N] = {2,  3,  5,  7,  11, 13, 17, 19,
                      23, 29, 31, 37, 41, 43, 47, 53};
int main() {
  cin >> x >> y >> k;
  if (x + y <= k) {
    cout << "Yes";
    return 0;
  }
  cout << "No";
}
