#include<stdio.h>
#include<stdlib.h>
#include<math.h>
int t,n,i,j,s;
int main()
{
    FILE*f=fopen("cifra.in","r");
    FILE*g=fopen("cifra.out","w");
    fscanf(f,"%d",&t);
    for(i=0;i<t;i++)
    {
        fscanf(f,"%d",&n);
        for(j=1;j<=n;j++) s+=pow(j,j);
        s%=10;
        fprintf(g,"%d\n",s);
    }
    fclose(f);
    fclose(g);
    return 0;
}