#include<iostream>
#include<fstream>
#include<algorithm>

using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");
int i, j, v[11][6],s,n,t,h;

int main()
{
    for(i=1;i<=9;i++)
    {
        s=1;
        for(j=1;j<=3;j++)
        {
            s*=i;
            v[i][j]=s%10;
        }
        s*=i;
        v[i][0]=s%10;
    }
    fin>>t;
    for(h=1;h<=t;h++)
    {
        fin>>n;
        s=0;
        for(i=1;i<=n;i++)
        {
            s+=v[i%10][i%4];
        }
        fout<<s%10<<"\n";
    }
    fin.close();
    fout.close();
    return 0;
}