#include <fstream>
#include <cmath>

using namespace std;

ifstream fin("cifra.in");
ofstream fout("cifra.out");

int main()
{
    unsigned N,i,T,x,S[1001];
    fin>>T;
    for(i=1;i<=T;i++)
    {
        fin>>N;
        S[i]=0;
        for(x=1;x<=N;x++)
        {
            S[i]=S[i]+pow(x,x);
        }
    }
    for(i=1;i<=T;i++)
    {
        fout<<S[i]%10<<endl;
    }
    return 0;
}