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