#include <iostream>
#include <fstream>
#include <string>
#include <math.h>
using namespace std;
int main()
{
	ifstream f("cifra.in");
	ofstream g("cifra.out");
	string aux;
	long int n,s;
	int nr;
	f>>aux; 
	n = stol(aux);
	for (long int i=0;i<n;i++) {
		f>>aux; 
		nr = stol(aux);
		s+=pow(nr,nr); g<<s%10;}
	f.close();
	g.close();
	return 0;
}