#include<fstream>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int ucif(int n)
{
    unsigned long long s1=0,s,i,j;
    for(i=1;i<=n;i++)
    {
        s=1;
        for(j=1;j<=i;j++)
        s=(s*i)%10;
        s1=(s1+s)%10;
    }
    return s1;
}

int main()
{
    unsigned long long x,n,i,j,s;
    f>>n;
    for(i=1;i<=n;i++)
    {
        f>>x;
        g<<ucif(x)<<'\n';
    }
}