#include<stdio.h>
#include<math.h>
FILE *f=fopen("cifra.in","r");
FILE *g=fopen("cifra.out","w");
long i,n,r,s,p,is,a[10000];
int main()
{
fscanf(f,"%ld",&n);
for(i=2;i<=n;i++) { fscanf(f,"%ld\n",&a[i]);
                    s+=pow(a[i],a[i]);
                    fprintf(g,"%ld\n",s%10); 
                   }
fclose(f);
fclose(g);
return 0;
}