#include<iostream>
#include<fstream>
using namespace std;
int sum(int n)
{
    int i,j,t,s=0;
    for(i=1;i<=n;i++)
    {
        t=i;
        for(j=1;j<=i-1;j++)
        t=t*i;
        s=s+t;}
return s;
}

int main()
{
    int T,n,s;
    ifstream f("cifra.in");
    ofstream g("cifra.out");
    f>>T;
    while(T--)
    {
        f>>n;s=0;
        s=sum(n);
        s=s%10;
        g<<s<<endl;
    }
    return 0;
}