#include <fstream>
#include<cstring>
#include<cmath>
using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");
char n[105];
int main()
{
    int t,k,i,u=0,s,r,q,z=0;
    fin>>t;
    while(t!=0)
    {
        fin>>n;
        s=0;u=0;z=0;
       if(strlen(n)<1) u=n[strlen(n)-1]-'0';
       else {z=n[strlen(n)-2]-'0';u=n[strlen(n)-1]-'0';}
        for(i=1; i<=z*10+u; i++)
        {
            r=i%10;
            q=i%4;
           if(r!=0){ s=s+pow(r,q);}
           else s=s;
            s=s%10;
        }
        t--;
        fout<<s<<"\n";
    }
    return 0;
}