#include <iostream>
#include <fstream>
using namespace std;
int putere(int x,int y)
{
    int p=1;
    for(int i=1;i<=y;i++)
        p*=x;
    return p;
}

int main()
{
    ifstream f("cifra.in");
    int t,v[30],i,n;
    f>>t;
    ofstream g("cifra.out");
    for(i=1;i<=t;i++)
    {
        f>>v[i];
        int n=0;
        for(int j=1;j<=v[i];j++)
            n+=putere(j,j);
        g<<n%10<<endl;
    }
    f.close();
    g.close();
}