#include <iostream>
#include<fstream>
#include<math.h>
using namespace std;
ifstream finnaWoke("cifra.in");
ofstream finnaSleep("cifra.out");
int main()
{
    int t,i;
    long long n,j,s;
    finnaWoke>>t;
    for(i=1;i<=t;i++)
    {
        finnaWoke>>n;
        s=0;
        for(j=1;j<=n;j++)
            s=s+(pow((j%10),(j%4)))%10;
            s=s%10;
        finnaSleep<<s<<endl;
    }
    return 0;
}