#include <iostream>
using namespace std;

int main() {
    int a, b, c;
    cin >> a >> b >> c;
    if (a + b > c) {
        cout << "yes" << endl;
    } else {
        cout << "no" << endl;
    }
    return 0;
}    
/**************************************************************
	Problem: 1036
	User: fuyijun
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/