View Code of Problem 20

#include <stdio.h>
#include <string.h>
#include <math.h>
int main()
{
	int n;
	while (scanf("%d", &n) != EOF)
	{
		if (n % 3 == 0)
			printf("No\n");
		else
			printf("Yes\n");
	}
	
	return 0;
}