View Code of Problem 3696

#include <bits/stdc++.h>
#include <math.h>
using namespace std;


int main() {
	int n;
	while (cin >> n) {
		if (n == 0) {
			cout << 1 << endl;
			continue;
		}
		long long r = n;
		for (int i = 0; i < n-1; ++i) {
			r *= n;
		}
		cout << r%10 << endl;
	}
	
	return 0;
}