#include <iostream>
#include <fstream>
using namespace std;

int main()
{
    long long n,ct=0,i,p=1,j,aux,s;
    ifstream f("cifra.in");
    ofstream g("cifra.out");
    f>> n;
    for(i=1;i<=n;i++)
    {
        f>>s;
        for(j=1;j<=i;j++)
            p*=s;
        ct+=p%10;
        p=1;
        aux=ct%10;
        g<< aux<< "\n";
    }
    f.close();
    g.close();
    return 0;
}