/* anaareunmaramar -> 5 */
#include<iostream>
#include<fstream>
#include<string.h>
#include<cstdlib>
using namespace std;
int main()
	{int v[200],i,j,nr,n,S,p,k;
	 char s[20];
	 ifstream fin("cifra.in");
	 ofstream fout("cifra.out");
	 fin>>n; fin.get();
	 for(i=0;i<n;i++)
        {fin>>s;
         v[i]=atoi(s);
        }
    cout<<endl;
    for(i=0;i<n;i++)
        {S=0;
         for(j=1;j<=v[i];j++)
            {p=1;
             for(k=1;k<=j;k++)
                p=p*j;
             S=S+p;
            }

         fout<<S%10<<endl;
        }
	}