#include <bits/stdc++.h>
#pragma comment(linker, "/STACK:128777216")
using namespace std;
const long long LINF = 1000000000000000000LL;
const int INF = 1000000000;
const long double eps = 1e-9;
const long double PI = 3.1415926535897932384626433832795l;
void prepare(string s) {}
int a, b, c;
void read() {
  scanf("%d %d %d", &a, &b, &c);
  printf("%s\n", (a + b >= c) ? "yes" : "no");
}
void solve() {}
int main() {
  prepare("");
  read();
  solve();
  {};
  return 0;
}
