// solved: 2025-09-13
#pragma region templates
#include <bits/stdc++.h>
using namespace std;

//型省略
using ll = long long;
using ull = unsigned long long;
using lll = __int128;
using ld = long double;
using pii = pair<int,int>;
using pll = pair<ll,ll>;
template<class T> using vec = vector<T>;
template<class T> using mat = vec<vec<T>>;
using vecl = vec<ll>;
using matl = mat<ll>;
using vvvl = vec<vec<vec<ll>>>;
using vvvvl = vec<vec<vec<vec<ll>>>>;
using vecs = vec<string>;
using mats = mat<string>;
using vecld = vec<ld>;
using matld = mat<ld>;
template<class T> using pq = priority_queue<T, vec<T>>; //大きい順
template<class T> using pq_g = priority_queue<T, vec<T>, greater<T>>; //小さい順

//定数関連
const int INF = 1001001001;
const ll LINF = (1LL << 60);
const double DINF = 1e18;
const double pi = acos(-1.0);
constexpr array<int,4> dx2 = {1, 0, -1, 0};
constexpr array<int,4> dy2 = {0, 1, 0, -1};
constexpr array<int,8> dx3 = {1, 1, 0, -1, -1, -1, 0, 1};
constexpr array<int,8> dy3 = {0, 1, 1, 1, 0, -1, -1, -1};

//まっくろくろすけ
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define nfor(i, s, n) for(ll i = s; i < (n); i++)
#define rfor(i, s, n) for(ll i = (s) - 1; i >= (n); i--)
#define for0(i,n) for(ll i = 0; i < (n); i++)
#define for1(i,n) for(ll i = 1; i <= (n); i++)
#define nper(v) next_permutation(all(v))
#define YES cout << "Yes\n"
#define NO cout << "No\n"
#define dame cout << -1 << "\n"
#define YN {cout << "Yes\n";} else {cout << "No\n";}
#define eudist(x, y) ((x)*(x) + (y)*(y))
#define L1(x1, y1, x2, y2) (abs((x1) - (x2)) + abs((y1) - (y2)))

//ACL使う？
/*
//#include "atcoder/modint"
//#include "atcoder/convolution"
//#include "atcoder/dsu"
//#include "atcoder/fenwicktree"
//#include "atcoder/lazysegtree"
//#include "atcoder/math"
//#include "atcoder/maxflow"
//#include "atcoder/mincostflow"
//#include "atcoder/scc"
//#include "atcoder/segtree"
//#include "atcoder/string"
//#include "atcoder/twosat"
using namespace atcoder;
using mint = modint998244353;
//using mint = modint1000000007;
//using mint = modint; // 好きな数で取りたいとき。上で宣言→main内で set_mod
//mint::set_mod(m); // これで m で mod とれるよ（main の中で呼んでね）
using vecmint = vec<mint>;
using matmint = mat<mint>;
using vvvmint = vec<vec<vec<mint>>>;
*/
#pragma endregion

//関数

//メイン関数ここから
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int N; cin >> N;
    cout << N - 1 << "\n";
}