#include<fstream.h>
#include<iostream.h>
#include<math.h>
long i,n,t,a,j;
unsigned long b;
int main()
{ifstream f("cifra.in");
ofstream g("cifra.out");
f>>t;
for(i=1;i<=t;i++)
{f>>n;b=0;
for(j=1;j<=n;j++)
b=b+(int)pow(j%10,j%10);
g<<b%10<<endl;}
f.close();
g.close();
return 0;}