#include <iostream>
#include <fstream>
#include <math.h>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
long long int n,i,a[100000000],i2;
unsigned long long int s;
int main()
{
    f>>n;
    for (i=1; i<=n; i++)
    {
        f>>a[i];
    }
    for (i=1; i<=n; i++)
    {
        for (i2=1; i2<=a[i]; i2++)
        {
            s=s+pow(i2,i2);
        }
        g<<s%10<<"\n";
        s=0;
    }
    return 0;
}