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

#ifdef LOCAL
    #define eprintf(...) fprintf(stderr, __VA_ARGS__)
#else
        #define eprintf(...) 42
#endif

#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define repi(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define all(x) (x).begin(),(x).end()
#define foreach(u,v) for(auto (u) : (v))
#define pb push_back
#define mp make_pair
#define mt make_tuple

typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<ll, ll> pll;
typedef vector<ll> vl;

const int inf = 1e9;
const ll linf = 1LL<<60;
const ll mod = 1e9 + 7;
const double eps = 1e-9;

/*
  n+(n+1)+(n+2)+(n+3)+...+(n+N-1)
*/

ll gcd(ll a, ll b)
{
  if(a < b) return gcd(b, a);
  if(b == 0) return a;
  return gcd(b, a%b);
}

int main()
{
  int n;
  cin >> n;

  cout << gcd((ll)n*(n-1)/2, n) << endl; 

  return 0;
}