#include <fstream>
#include <cstring>
using namespace std;
ifstream cin("cifra.in");
ofstream cout("cifra.out");
int main()
{
    int t,n,i,x,j,s;
    char c,v[105];
    cin>>t;
    cin.get(c);
    for(i=1;i<=t;i++)
    {
        n=0;
        while(cin.get(c)&&c>='0'&&c<='9')
            v[++n]=c;
        if(n>=2)
            x=(v[n-1]-'0')*10+v[n]-'0';
        else
            x=v[n]-'0';
        s=0;
        for(j=1;j<=x;j++)
        {
            if(j%4==0)
                s+=j*j*j*j;
            if(j%4==1)
                s+=j;
            if(j%4==2)
                s+=j*j;
            if(j%4==3)
                s+=j*j*j;
        }
        cout<<s%10<<'\n';
    }
    return 0;
}