#include "stdio.h"
using namespace std;
	int main()
		{
			FILE * a;FILE * b;
			a = fopen("cifra.in","r");
			b = fopen("cifra.out","w");
			int t,aux,k,aux1,uc;
			fscanf(a,"%d",&t);
			long long int s=0;
			for(int i=0;i<t;i++)
				{
					fscanf(a,"%d",&aux);
					k = aux;
					k--;
					aux1 = aux;
					while(k)
						{
							aux = aux*aux1;
							k--;
						}
					s+=aux;
					uc = s % 10;
					fprintf(b,"%d\n",uc);
				}
			fclose(a);
			fclose(b);
			return 0;
		}