#include <stdio.h>

int main() {
    int a, b, c;
    scanf("%d %d %d", &a, &b, &c);
    if (a + b > c) {
        printf("yes\n");
    } else {
        printf("no\n");
    }
    return 0;
}
}
/**************************************************************
	Problem: 1036
	User: fuhoubin
	Language: C++
	Result: Compile Error
****************************************************************/