#include <iostream>
#include <fstream>
#include <math.h>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");

int main()
{int n,a,i,s;
f>>n;
while(!f.eof()) {f>>a; s=0; for(i=1;i<=a;i++) {s+=pow(i,i);s%=10;} g<<s<<"\n";}
return 0;}