<?php
//Request Question
function getq($get_word=null){
	if($get_word===null){
		return str_replace("\n","",fgets(STDIN));
	}else if($get_word===1){
		return explode(" ",str_replace("\n","",fgets(STDIN)));
	}
}

/*		START		*/
$a=getq(1);
if($a[0]+$a[1]>=$a[2]){
	echo "yes\n";
}else{
	echo "No\n";
}
?>