#include<stdio.h>
FILE *f=fopen("cifra.in","r");
FILE *g=fopen("cifra.out","w");
int i,j,n,k,p,s=0;
int v[12]={0,1,1,4,4,2,1,1,4,4,2};
int main()
{
fscanf(f,"%d",&t);
for(q=1;q<=t;q++)
{
fscanf(f,"%d",&n);
	for(i=1;i<=n;i++)
	{
		k=i%10;
		p=1;
		for(j=1;j<=k;j++)
		{
			p=p*i;
		p=p%10;
		}
		s=s+p;
	}
fprintf(g,"%d", s%10);
}
return 0;
}