742/A - Arpa’s hard exam and Mehrdad’s naive cheat

#include <iostream>
#define ll long long
using namespace std;
int main ()
{
    ll n;
    cin>>n;

    if (!n)
        cout<<1;
    else
    {
        n %= 4;
        int v[] = {6,8,4,2};
        cout<<v[n];
    }

    return 0;
}