#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int i,v[30000],j,s=0,T;
void citire(int v[30000],int &T)
{
    f>>T;
    for(i=0;i<T;i++)
    {
        f>>v[i];
    }
}
int powe(int x)
{
    int a=x,p=1;
    while(a>0)
    {
        p*=x;
        p=p%10;
        a--;
    }
return p%10;
}
int cifra(int x)
{
    if(x==1)
        return 1;
    else
        return cifra(x-1)+powe(x)%10;
}
int main()
{
    citire(v,T);
    for(i=0;i<T;i++)
        g<<cifra(v[i])%10<<"\n";
    return 0;
}