#include <cstdio>
#include <cstring>
using namespace std;
int v[105];
char s[105];
int uc(int n)
{
    int i,p=1,e;
    e=n%4;
    if(e==0)
        e=4;
    n=n%10;
    for(i=1;i<=e;i++)
        p=p*n;
    return p;
}
int main()
{
    freopen("cifra.in","r",stdin);
    freopen("cifra.out","w",stdout);
    int t,i,l;
    scanf("%d\n",&t);
    v[1]=1;
    for(i=2;i<=100;i++)
        v[i]=(v[i-1]+uc(i))%10;
    while(t)
    {
        gets(s);
        l=strlen(s);
        if(l==1)
            printf("%d\n",v[s[0]-'0']);
        else
            {
                i=(s[l-2]-'0')*10+s[l-1]-'0';
                printf("%d\n",v[i]);
            }
        t--;
    }
    return 0;
}