#include "stdio.h"

int main()
{
    unsigned long long int totalQuantity=0;
    scanf("%u",&totalQuantity);
    printf("%u\n",(totalQuantity%7));
    return 0;
}

unsigned long long is not bigger than 18446744073709551615 < 10^20. In this problem 1<="totalQuantity"<=10^50.
And if you want read unsigned long long you must write scanf("%I64u",&n);