Boss Battle Solution:

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

int main(){
    // #ifndef TESTING
    // freopen("input.txt", "r", stdin);
    // freopen("output.txt", "w", stdout);
    // #endif
    
    int nPillars;
    cin >> nPillars;
    if(nPillars < 4){
        cout << 1 << endl;
    } else {
        cout << nPillars - 2 << endl;
    }
    return 0;   
}