View Code of Problem 3696

#include <algorithm>
#include <cctype>
#include <climits>
#include <cmath>
#include <cstdio>
#include <cstring>
#include <iostream>
#include <map>
#include <set>
#include <stack>
#include <string>
#include <vector>
using namespace std;

int main(void)
{
    int n;
    while (scanf("%d",&n))
    {
        int ans = n;
        if (n == 0)
            printf("1\n");
        else
        {
            for (int i = 1; i < n; i++)
            {
                ans *= n;
                ans %= 10;
            }
            printf("%d\n", ans % 10);
        }
    }
}