#include<stdio.h>
int main(){
	int a,b,c;
	scanf("%d %d %d",&a,&b,&c);
	if(a+b>c){
		printf("%s","yes");
	}else{
		printf("%s","no");
	}
	return 0;
}
/**************************************************************
	Problem: 1036
	User: admin
	Language: C
	Result: Accepted
	Time:9 ms
	Memory:1144 kb
****************************************************************/