#include <stdio.h>
int main(void)
{
	int a, b, c;
	scanf_s("%d", &a);
	scanf_s("%d", &b);
	scanf_s("%d", &c);
	if (a >= 1 && b >= 1 && a <= 500 && b <= 500)
	{
		if (a + b <= c)
		{
			printf("Yes\n");
		}
		else
		{
			printf("No\n");
		}
	}
}