#include <stdio.h>

int main(void) {
	int a=100,b,c,d,e,x;
	int count=0;
	    
	 
		do
		{
			b=a/100;
		    c=a/10;
		    d=c%10;
		    e=a%10;
		    x=b+d+e;
		    
			if(x%7==0){
				count++;
			}
			a=a+1;
		}
		while((100<=a) && (a<=999));

	printf("%d個 \n",count);
	return 0;
}