#include <fstream>
using namespace std;
int pow(int x, int y){
	int rez = 1;
	for(int i = 1; i<=y; i++){
		rez = rez * x;
	}
	return rez;
}
int main(){
	int T, nr, sum = 0;	
	ifstream fileIn("cifra.in");
	ofstream fileOut("cifra.out");
	if(fileIn.is_open()){
		fileIn>>T;
		for(int i = 0; i<T; i++){
			fileIn>>nr;
			for(int k = 1; k<=nr; k++){
				sum = sum + pow(k,k); 		
			}
			fileOut<<sum%10<<endl;
			sum = 0; nr = 0;
		}
	}
	fileIn.close();
	fileOut.close();
	return 0;
}