#include "bits/stdc++.h"
using namespace std;
#define ll long long int
#define rep(i,n) for( int i = 0; i < n; i++ )
#define rrep(i,n) for( int i = n; i >= 0; i-- )
#define REP(i,s,t) for( int i = s; i <= t; i++ )
#define RREP(i,s,t) for( int i = s; i >= t; i-- )
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define INF 2000000000
#define mod 1000000007
#define INF2 1000000000000000000

int ans = 0;
int N;
void show(vector<int> v) {
    rep(i, v.size()) cout << v[i] << " ";
    cout << endl; 
}


void dfs(int depth, int num) {
    if (depth == N) {
        ans++;
        return;
    }
    rep(i, depth - num + 1) dfs(depth + 1, num + i);
    
}


int main(void)
{
    cin.tie(0);
    ios::sync_with_stdio(false);
    cin >> N;
    dfs(1, 0);
    cout << ans << endl;


    return 0;
}