#include "bits/stdc++.h"
//#include <boost/multi_array.hpp>
//#include <boost/optional.hpp>
//#include <boost/range/irange.hpp>
//#include <boost/range/algorithm.hpp>
//#include <boost/range/adaptors.hpp>
using namespace std;
using ll = long long;
using ld = long double;
using P = pair<int, int>;
#define rep(i, n) for (int i = 0; i < (n); i++)
#define rep2(i, x, n) for (int i = x; i < (n); i++)
#define all(n) begin(n), end(n)
struct cww {
    cww() {
        ios::sync_with_stdio(false);
        cin.tie(0);
    }
} star;
const long long INF = numeric_limits<long long>::max();

void Main() {
    int n;
    cin >> n;
    cout << n - 1 << endl;
}

int main() {
    std::cin.tie(nullptr);
    std::ios_base::sync_with_stdio(false);
    std::cout << std::fixed << std::setprecision(15);
    Main();
    return 0;
}