#include<iostream>
#include<cstdio>
#include<cstring>
#include<string>
#include<algorithm>
#include<bitset>
#include<vector>
#include<deque>
#include<queue>
#include<map>
#include<set>
#include<stack>
#include<cmath>
#include<iomanip>
#include <functional>
using namespace std;
typedef long long ll;
//--------------------------

int main()
{
	int n;
	cin >> n;
	if (n == 0) {
		cout << 1 << endl;
		return 0;
	}

	long double d = 1 + sqrt(3);
	ll m;
	int i = 1;

	while (i < n) {
		d = d * d;
		m = d;
		d = d - m;
		d = d + m % 1000;
		i = i * 2;
	}

	if (i != n) {
		i = i / 2;
		while (i < n) {
			d = d * (1 + sqrt(3));
			m = d;
			d = d - m;
			d = d + m % 1000;
			i++;
		}
	}

	cout << (int)d % 1000 << endl;

	return 0;
}