#include <iostream>
#include <fstream>
#include <math.h>
using namespace std;
ifstream f("cifra.in");
ofstream o("cifra.out");
int main()
{
    int a[100],i,n,s,b;
    f >> n;
    for(i=1;i<=n;i++)
        f >> a[i];
    for(i=1;i<=n;i++){
        s=0;
        for(b=1;b<=a[i];b++){
            s=s+pow(b,b);
    }
    o << s%10 << endl;
    }
    return 0;
}