#include <fstream>
#include <iostream>
#include <algorithm>
#include <cmath>
#include <cstdio>
using namespace std;
fstream fin("cifra.in",ios::in);
fstream fout("cifra.out",ios::out);

int main(){
    unsigned long t,i,ii,z[100],s[100],f,p,st=0;
    fin>>t;
    for(i=1;i<=t;i++){

        fin>>z[i];
        p=1; s[i]=0;

    for(ii=1;ii<=i;ii++)
        p=(p*z[i])%10;
        s[i]=(s[i]+p)%10;}

        for(i=1;i<=t;i++){
            st+=s[i];
        fout<<st%10<<endl;}

        fin.close();
        fout.close();
        return 0;}