[Gold 5] 2133번 타일 채우기

import java.io.*;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int n = Integer.parseInt(br.readLine());
        int[] dp = new int[31];
        dp[0] = 1;
        
        for(int i=2; i<=n; i++) {
            for(int j=1; j<=i/2; j++) {
                dp[i] += dp[i-2*j]*2;
            }
            
            dp[i] += dp[i-2];
        }
        
        System.out.println(dp[n]);
    }
}