#include<stdio.h>

int main(void)
{
	int a;
	int b;
	int c;
	
	scanf("%d %d %d",&a,&b,&c);

	if(a + b >= c)&&(a,b>=1)&&(a,b<=500)&&(c>=1)&&(c<=1000){
		printf("Yes");
	}
	else{
		printf(" No");
	}
	return(0);
}