#include <iostream>
#include <vector>
#include <string>

#define REP(i, a, b) for (int i = (a); i < (b); i++)
#define dump(s) cerr << __LINE__ << "\t:" << #s << " = " << (s) << endl
    
using namespace std;

int main () {
    int n;
    cin >> n;
    cout << n - 1 << endl;
    
    return 0;
}