#include <stdio.h>

int main(void)
{
    int n = 100;
    int i = 0;

    while (n <= 999)
    {
        int sum = n/100 + (n/10)%10 + n%10;

        if (sum % 7 == 0)
        {
            i++;
        }
        n++;
    }

    printf("%d\n", i);
    return 0;
}