ural 1009. K-based Numbers dp 高精度

//0.125	3 854 KB
import java.math.BigInteger;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner cin = new Scanner(System.in);// 输入
		BigInteger dp[][] = new BigInteger[2007][2];
		int n, k;
		n = cin.nextInt();
		k = cin.nextInt();
		dp[1][0] = (BigInteger.valueOf(k - 1));
		dp[1][1] = (BigInteger.valueOf(0));
		for (int i = 2; i <= n; i++) {
			dp[i][0] = (dp[i - 1][0].add(dp[i-1][1])).multiply(BigInteger.valueOf(k-1));
			dp[i][1] = (dp[i - 1][0]);
		}
		System.out.println(dp[n][0].add(dp[n][1]));
	}
}