#include<iostream>
#include<cstdio>
#include<math.h>
using namespace std;
int main(void)
{
    freopen("cifra.in","r",stdin);
    freopen("cifra.out","w",stdout);
    int T,N;
    cin>>T;
    for(int i=0;i<T;i++)
    {
        cin>>N;
        int s=0;
        for(int j=1;j<=N;j++)
        {
            s=s+pow (j,j);
        }
        cout<<s%10<<"\n";
    }





}