#include <iostream>
#include <fstream>
#include <math.h>
using namespace std;

int main()
{
    ifstream f ("cifra.in");
    ofstream g ("cifra.out");
    int t,n,i,j,c,m;
    f>>t;
    for (i=1;i<=t;i++)
    {  f>>n; c=0;
        for (j=1;j<=n;j++)
           {m=pow(j,j);
            c=c+m%10;
           }
       c=c%10;
      g<<c<<endl;
    }

    f.close();
    g.close();

    return 0;
}