#include <stdio.h>
int t,i,j,k,n,sj,s;
int main () {
 FILE*in = fopen("cifra.in", "r");
 FILE*out= fopen("cifra.out", "w");

 fscanf(in, "%d", &t);

 for (i=1;i<=t;i++) {
	fscanf(in, "%d", &n);
	s=0;
	for (j=1;j<=n;j++) {
		sj=1;
		for (k=1;k<=j;k++) {
			sj*=j;
		}
		s+=sj;
	}
 fprintf(out, "%d", s%10);
 }

 fclose(in);
 fclose(out);
 return 0;
}