#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");
int pow(int n,int x)
{
    unsigned long long index=1;
    while(x)
    {
        index=index*n;
        x--;
    }
    return index;
}
int main()
{
    unsigned long long n,x,index=0;
    fin>>n;
    while(n)
    {
        fin>>x;
        index=index+pow(x,x);
        fout<<index%10<<"\n";
        n--;
    }
    fin.close();
    fout.close();
    return 0;
}