Problem:
Score : 200 points

Problem Statement

There are N balls placed in a row.
AtCoDeer the deer is painting each of these in one of the K colors of his paint cans.
For aesthetic reasons, any two adjacent balls must be painted in different colors.

Find the number of the possible ways to paint the balls.

Constraints

1≦N≦1000

2≦K≦1000

The correct answer is at most 2^{31}-1.

Input

The input is given from Standard Input in the following format:

N K

Output

Print the number of the possible ways to paint the balls.

Sample Input 1

2 2

Sample Output 1

2

We will denote the colors by 0 and 1. There are two possible ways: we can either paint the left ball in color 0 and the right ball in color 1, or paint the left in color 1 and the right in color 0.

Sample Input 2

1 10

Sample Output 2

10

Since there is only one ball, we can use any of the ten colors to paint it. Thus, the answer is ten.

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.io.*;
import java.util.*;
 
public class Main {
 
	void submit() {
	    long N = nextInt();
	    long K = nextInt();
	    long total = K; 
	    
	    for(long i=1; i<N; i++){
	        total *= (K-1);
        }
        out.println(total);
	}

	void preCalc() {
 
	}
 
	void stress() {
 
	}
 
	void test() {
 
	}
 
	Main() throws IOException {
		br = new BufferedReader(new InputStreamReader(System.in));
		out = new PrintWriter(System.out);
		preCalc();
		submit();
		//stress();
		//test();
		out.close();
	}
 
	static final Random rng = new Random();
 
	static int rand(int l, int r) {
		return l + rng.nextInt(r - l + 1);
	}
 
	public static void main(String[] args) throws IOException {
		new Main();
	}
 
	BufferedReader br;
	PrintWriter out;
	StringTokenizer st;
 
	String nextToken() {
		while (st == null || !st.hasMoreTokens()) {
			try {
				st = new StringTokenizer(br.readLine());
			} catch (IOException e) {
				throw new RuntimeException(e);
			}
		}
		return st.nextToken();
	}
 
	String nextString() {
		try {
			return br.readLine();
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}
 
	int nextInt() {
		return Integer.parseInt(nextToken());
	}
 
	long nextLong() {
		return Long.parseLong(nextToken());
	}
 
	double nextDouble() {
		return Double.parseDouble(nextToken());
	}
}