A. Cookies

time limit per test

2 seconds

memory limit per test

256 megabytes

input

standard input

output

standard output

Fangy collects cookies. Once he decided to take a box and put cookies into it in some way. If we take a square k × k in size, divided into blocks 1 × 1 in size and paint there the main diagonal together with cells, which lie above it, then the painted area will be equal to the area occupied by one cookie k in size. Fangy also has a box with a square base 2n × 2n, divided into blocks 1 × 1 in size. In a box the cookies should not overlap, and they should not be turned over or rotated. See cookies of sizes 2 and 4 respectively on the figure:

To stack the cookies the little walrus uses the following algorithm. He takes out of the repository the largest cookie which can fit in some place in the box and puts it there. Everything could be perfect but alas, in the repository the little walrus has infinitely many cookies of size 2 and larger, and there are no cookies of size 1, therefore, empty cells will remain in the box. Fangy wants to know how many empty cells will be left in the end.

Input

The first line contains a single integer n (0 ≤ n ≤ 1000).

Output

Print the single number, equal to the number of empty cells in the box. The answer should be printed modulo 106 + 3.

Sample test(s)

input

3

output

9

Note

If the box possesses the base of 23 × 23 (as in the example), then the cookies will be put there in the following manner:

解题说明：此题是问给定一个大的图形，用小的图形去覆盖后，剩下的空闲格子数有多少。可以通过找规律来做，发现当输入为n，即面积大小为2^n*2^n时，剩下的空格数正好为3n。 当然，如果超过了10^6+3，就要取余数。

#include <iostream>#include<algorithm>#include<cstdio>#include<cmath>#include<cstring>#include<cstdlib>using namespace std;int main(){int n,i,u=1;scanf("%d",&n);for(i=1;i<n;i++){u*=3;u%=1000003;}printf("%d\n",u);return 0;}