#include <bits/stdc++.h>
using namespace std;
long long gcd(long long a, long long b) { return b ? gcd(b, a % b) : a; }
long long lcm(long long a, long long b) { return a * b / gcd(a, b); }
bool isLowerCase(char c) { return (c >= 'a' && c <= 'z'); }
const string bans(bool ans) { return (ans ? "Yes" : "No"); }
int main() {
  int a, b, c;
  cin >> a >> b >> c;
  int ans = (a >= c || b >= c || a + b >= c);
  cout << bans(ans) << endl;
  return 0;
}
