#include<iostream>
using namespace std;

FILE*fout=fopen("cifra.out","w");
FILE*fin=fopen("cifra.in","r");

int main()
{    
    int i,t,n[i],tot=0,tm,p=1;    
    fscanf(fin,"%d",&t);
    for(i=1;i<=t;i++){
       fscanf(fin,"%d",&n[i]);
       for(n[i]=n[i];n[i]>=1;n[i]--){
       for(tm=1;tm<=n[i];tm++) p*=n[i];
       tot+=p;
       p=1;
       }
       fprintf(fout,"%d\n",tot%10);
       tot=0;
    } 
    fclose(fin);
    fclose(fout);    
    return 0;
}