b11727

b11727/Main.java

@@ -0,0 +1,21 @@
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    public static void main(String[] args) throws IOException {
+        BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
+        int n = Integer.parseInt(bf.readLine());
+
+        long[] dp = new long[n + 1];
+        dp[1] = 1;
+        if(n >= 2) {
+            dp[2] = 3;
+        }
+
+        for(int i = 3; i <= n; i++) {
+            dp[i] = (dp[i - 1] % 10007 + dp[i - 2] * 2 % 10007) % 10007;
+        }
+
+        System.out.println(dp[n]);
+    }
+}