#include<bits/stdc++.h>
using namespace std;

int odd(int n){
    int temp = 0;
    if(n == 1) return 1;
    for(int i = n-1; i >=1; i -= 2){
        temp += odd(i);
    } 
    return temp * n;
}
int even(int n){
    int temp = 0;
    if(n == 2) return n * 1;
    for(int i = n-1; i>=1; i -= 2){
        temp += even(i);
    }
    return temp * n;
}
int main(){  
    int n; cin >> n;
    int ans = 0;
    if(n % 2 == 0){
        ans += odd(n);
    }else{
        ans += even(n);
    }
    cout << ans << endl;
    return 0;
}