//soustractions
#include <iostream>

using namespace std;

int main() {
  int n = 3;
  cout << "n vaut " << n << endl;
  n = n - 1;
  cout << "n = n-1 -> n vaut maintenant " << n << endl;
  n -= 1;
  cout << "n -= 1 -> n vaut maintenant " << n << endl;
  n--;
  cout << "n-- -> n vaut maintenant " << n << endl;
  return 0;
}