#include <iostream>
#include <fstream>
#include <cmath>

using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");

int sum(int n)
{
 int i,j,s=0,p;
 for (i=1;i<=n;i++)
    {
    p=1;
    for (j=1;j<=i;j++) p*=i;
    s+=p;
 }
 return (s%10);

}
int main()
{
    int v[30000];
 int t,i;
 f >> t;
 for(i=1;i<=t;++i) f >> v[i];
 for (i=1;i<=t;++i) g << sum(v[i]);

 }