#include<fstream.h>
#include<string.h>
ifstream fin("cifra.in");
ofstream fout("cifra.out");
int main()
{int t,n,s,i,j,s1,k;

fin>>t;
for(i=1;i<=t;i++)
   {fin>>n;   s=0;
    for(j=1;j<=n;j++)
	{s1=1;
	 for(k=1;k<=j;k++)
	     s1*=j;
    s+=s1;
    if(s>=10)
    s=s%10;
       }
    fout<<s<<"\n";
   }



fin.close();
fout.close();
return 0;
}