백준 13301 자바 - 타일 장식물

// 타일 장식물
package Silver_V_5;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Ex13301 {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        int n = Integer.parseInt(br.readLine());

        long[] dp = new long[81];

        dp[1] = 4;
        dp[2] = 6;
        for (int i = 3; i <= n; i++) {
            dp[i] = dp[i - 1] + dp[i - 2];
        }

        System.out.println(dp[n]);
    }
}