#include <fstream>
#include <iostream>
using namespace std;

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

long long t,i,j,a[100000000],s;

long long putere(long long int x,long long y)
{
  long long a=1;
while(y>0)
    if(y%2==0)
    {
        x=(x*x);
        y=y/2;
    }
    else
    {
        a=(a*x);
        y--;
    }
  return a;
}


int main()
{
    f>>t;
    for(i=1;i<=t;i++)
    {
        s=0;
        f>>a[i];
        for(j=1;j<=a[i];j++)
            s=s+putere(j,j);
        g<<s%10<<"\n";

    }
    return 0;
}