Preview:
#include <iostream>
using namespace std;

int initialValue;

void IncreaseNumber(int n){
  if(n == initialValue){
    return;
  }
  
  n += 5;
  cout << n << " ";
  IncreaseNumber(n);
}

void DecreaseNumber(int n){
  if(n <= 0){
    cout << n << " ";
    IncreaseNumber(n);
    return;
  }
  
  cout << n << " ";
  n -= 5;
  DecreaseNumber(n);
}

int main() {
    cin >> initialValue;
    
    DecreaseNumber(initialValue);

    return 0;
}
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