#include <iostream>
#include <algorithm>
#include <iomanip>
#include <vector>
#include <queue>
#include <set>
#include <map>

using namespace std;
typedef long long ll;

const ll MOD = 1000000007;

ll dp[3000][3000];

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << setprecision(10) << fixed;
    int N;
    cin >> N;
    ll ans = 0;
    if(N <= 2){
        cout << 0 << endl;
    }
    // 大 -> 小
    for(int i = 0; i < N; i++) dp[0][i] = 1;
    for(int i = 1; i < N; i++){
        for(int j = 0; j < N; j++){
            // a[i-1] > a[i]
            if(i%2 == 0){
                // (i-1, j) -> (i, 0 ~ j-1)
                dp[i][0] += dp[i-1][j];
                dp[i][j] -= dp[i-1][j];
            // a[i-1] < a[i]
            }else{
                // (i-1, j) -> (i, j ~ N-i-1)
                dp[i][j] += dp[i-1][j];
                dp[i][N-i] -= dp[i-1][j];
            }
        }
        dp[i][0] %= MOD;
        for(int j = 1; j < N; j++){
            dp[i][j] += dp[i][j-1];
            dp[i][j] %= MOD;
        }
    }
    ans += dp[N-1][0];
    // 小 -> 大
    for(int i = 0; i < N; i++){
        for(int j = 0; j < N; j++){
            dp[i][j] = 0;
        }
    }
    for(int i = 0; i < N; i++) dp[0][i] = 1;
    for(int i = 1; i < N; i++){
        for(int j = 0; j < N; j++){
            // a[i-1] > a[i]
            if(i%2 == 1){
                // (i-1, j) -> (i, 0 ~ j-1)
                dp[i][0] += dp[i-1][j];
                dp[i][j] -= dp[i-1][j];
            // a[i-1] < a[i]
            }else{
                // (i-1, j) -> (i, j+1 ~ N-i-1)
                dp[i][j] += dp[i-1][j];
                dp[i][N-i] -= dp[i-1][j];
            }
        }
        dp[i][0] %= MOD;
        for(int j = 1; j < N; j++){
            dp[i][j] += dp[i][j-1];
            dp[i][j] %= MOD;
        }
    }
    ans += dp[N-1][0];
    cout << (ans+MOD)%MOD << endl;
}