#include <cstdio>
#include <cstring>

using namespace std;
int i,j,n,s,b,a[105],t,x;
char S[105];
int main()
{
    freopen("cifra.in","r",stdin);
    freopen("cifra.out","w",stdout);
    s=0;
    scanf("%d",&t);
    for(i=1;i<=100;i++)
    {
        b=i;
        for(j=1;j<i;j++)
            b=(b*i)%10;
        s=s+b;s=s%10;
        a[i]=s;
    }
    for(i=1;i<=t;i++)
    {
        scanf("%s",&S);
        n=strlen(S);
        if(n-1>0) x=(S[n-2]-'0')*10+S[n-1]-'0';
        else
            x=S[n-1]-'0';
        printf("%d\n",a[x]);
    }
    return 0;
}