#include <fstream>
#include <cmath>
using namespace std;
ifstream cin ("cifra.in");
ofstream cout ("cifra.out");
int main()
{
    int n,s,i,v[30000],t,j;
    cin>>t;

    for (j=1;j<=t;j++)
    {
        cin>>v[j];
        s=0;
        for(i=1;i<=j;i++)
        {
        s=s+v[i]*v[i];
        }
         cout<<s%10<<endl;
    }
    return 0;
}