#include<fstream>
#include<math.h>
using namespace std;

fstream f("cifra.in",ios::in),g("cifra.out",ios::out);

int t;
long long n,v[30001];

int cifra(long long n)
{
long long i,c=0;
for(i=1;i<=n;i++)
    {
    c+= ( ( (long long)(pow(i%10,i%10)) )% 10 );
    c%=10;
    }
return c;
}

int main()
{
int i;
f>>t;
for(i=0;i<t;i++)f>>v[i];
f.close();
for(i=0;i<t;i++)g<<cifra(v[i])<<endl;
g.close();
return 0;
}