//#include <iostream>
#include<fstream>
#include<cstring>
#include<queue>
#include<vector>
#include<cmath>
#include<algorithm>
#include<map>
using namespace std;
ifstream cin("cifra.in");
ofstream cout("cifra.out");

int t,n,s;
char v[101];

int main()
{
    cin>>t;
    for(int j=1;j<=t;j++){
        cin>>v;
        s=0;

        if(strlen(v)>1){
            n=10*(v[strlen(v)-2]-'0')+v[strlen(v)-1]-'0';
        }else{
            n=v[strlen(v)-1]-'0';
        }
        for(int i=1;i<=n;i++){
            int p=i,x=1;
            while(p--){
                x*=i;
                x%=10;
            }
            s+=x;
            s%=10;
        }

        cout<<s<<'\n';
    }
    return 0;
}