#include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <numeric>
#include <functional>
#include <cmath>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <sstream>
#include <string>
#define repd(i,a,b) for (int i=(a);i<(b);i++)
#define rep(i,n) repd(i,0,n)
#define var auto
#define mod 1000000007
#define inf 2147483647
#define mp make_pair
#define pb push_back
typedef long long ll;
using namespace std;

template <typename T>
inline void output(T a, int p) {
    if(p){
        cout << fixed << setprecision(p)  << a << "\n";
    }
    else{
        cout << a << "\n";
    }
}
// end of template

int main() {
    cin.tie(0);
    ios::sync_with_stdio(0);
    // source code
    int n;
    cin >> n;
    int offset = n % 2 ? 0 : 1;
    vector<int> M(604);
    M[0] = M[1] = 2;
    repd(i, 2, 604){
        M[i] = (2 * M[i - 1] + 2 * M[i - 2]) % 1000;
    }
    
    if (n < 4) {
        output(M[n] - offset, 0);
    }
    else{
        (n -= 4) %= 600;
        output(M[n + 4] - offset, 0);
    }
    
    return 0;
}