#include<iostream>
using namespace std;
int main()
{    
    FILE*fout=fopen("cifra.out","w");
    FILE*fin=fopen("cifra.in","r");
    
    int i,t,n[299999],tot=0,tm,p=1;
        
    fscanf(fin,"%d",&t);
    
    for(i=0;i<=t-1;i++){
      fscanf(fin,"%d",&n[i]);
       
      for(;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;
}