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- import java.io.BufferedReader;
- import java.io.BufferedWriter;
- import java.io.IOException;
- import java.io.InputStreamReader;
- import java.io.OutputStreamWriter;
- public class Main{
- public static void main(String args[]) throws IOException{
- BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
- BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
- int num = Integer.parseInt(br.readLine());
- int[][] arr = new int[101][10];
- for(int i=1;i<10;i++) {
- arr[1][i] = 1;
- }
- for(int i=2;i<=num;i++) {
- for(int j=0;j<10;j++) {
- if(j==0) arr[i][j] = arr[i-1][j+1];
- else if(j==9) arr[i][j] = arr[i-1][j-1];
- else {
- arr[i][j] = arr[i-1][j-1] + arr[i-1][j+1];
- }
- arr[i][j] = arr[i][j]%1000000000;
- }
- }
- int res = 0;
- for(int i=0;i<10;i++) {
- res = res+arr[num][i];
- res = res%1000000000;
- }
- bw.write(res+"");
- bw.flush();
- bw.close();
- }
- }
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