#include<cstdio>
using namespace std;
void rezolvare(int m)
{
    int i,s=0;
    for(i=1;i<=m;i++)
    {
        if(i%10==1 || i%10==0 || i%10==5 || i%10==6)
            s=s+i;
        if(i%10==2)
        {
            if(i%4==1)
                s=s+2;
            if(i%4==2)
                s=s+4;
            if(i%4==3)
                s=s+8;
            if(i%4==4)
                s=s+6;
        }
        if(i%10==3)
        {
             if(i%4==1)
                s=s+3;
            if(i%4==2)
                s=s+9;
            if(i%4==3)
                s=s+7;
            if(i%4==4)
                s=s+1;
        }
        if(i%10==4)
        {
            if(i%2==1)
                s=s+4;
            else
                s=s+6;
        }
        if(i%10==7)
        {
            if(i%4==1)
                s=s+7;
            if(i%4==2)
                s=s+9;
            if(i%4==3)
                s=s+3;
            if(i%4==4)
                s=s+1;
        }
        if(i%10==8)
        {
             if(i%4==1)
                s=s+8;
            if(i%4==2)
                s=s+4;
            if(i%4==3)
                s=s+2;
            if(i%4==4)
                s=s+6;
        }
        if(i%10==9)
        {
            if(i%2==1)
                s=s+9;
            else
                s=s+1;
        }
        s=s%10;
    }
    printf("%d\n",s%10);
}
int main()
{
    freopen("cifra.in","r",stdin);
    freopen("cifra.out","w",stdout);
    int t,i,n,x;
    scanf("%d",&n);
    for(i=1;i<=n;i++)
        {
            scanf("%d",&x);
            rezolvare(x);
        }
    return 0;
}