#include<stdio.h>
#include<string.h>
int t;
char s[201];
int uc[201];
int main ()
{
    int i,nr,aux,j;
    freopen("cifra.in","r",stdin);
    freopen("cifra.out","w",stdout);
    scanf("%d\n",&t);
    for(i=1;i<=100;i++)
    {
        uc[i]=1;
        for(j=1;j<=i;j++)
        {
            uc[i]*=(i%10);
            uc[i]%=10;
        }
        uc[i]+=uc[i-1];
        uc[i]%=10;
    }

    for(i=1;i<=t;i++)
    {
        gets(s);
        nr=strlen(s);
        if(nr==1)
            aux=s[nr-1]-'0';
        else
            aux=(s[nr-2]-'0')*10+(s[nr-1]-'0');
        printf("%d\n",uc[aux]);
    }
    return 0;
}