View Code of Problem 3696

#include<stdio.h>
#include<string.h>
#include<string>
#include<algorithm>
using namespace std;
int main() {
	int n;
	while (scanf("%d", &n) != EOF) {
		if (n == 0) {
			printf("1\n");
			continue;
		}
		int count = n-1;
		int t = n % 10;
		while (count--) {
			t = t * n % 10;
		}
		printf("%d\n", t);
	}
}