Sapin

#include <unistd.h>
#include <stdlib.h>

void    ___(int __)
{
  int   _[5];

  _[3] = (_[4] = (_[0] = (_[2] = 7) - 6) - 1) - 1;
  while (++_[0] - 1 < __)
    _[2] = _[2] + (2 * (_[0] + 2)) - ((5 * _[0]) / 10 * 2);
  while ((++_[4] <= __ && !(_[0] = 0)) || (_[0] = -1) + 1)
    {
      while (++_[0] <= _[4] + 3 && (_[3] += 2, _[1] = -1, 1))
        while (++_[1] < (_[2] - _[3]) / 2 + _[3] || (write(1, "\n", 1) * 0))
          write(1, _[1] < (_[2] - _[3]) / 2 ? " " : "*", 1);
      _[3] = _[3] - (5 * (_[4] - 1) / 10) * 2 - 4;
    }
  _[3] = __ / 2 * 2 + 1;
  while (++_[0] < __ && (_[1] = -1))
    while (++_[1] < (_[2] - _[3]) / 2 + _[3] || (write(1, "\n", 1) * 0))
      write(1, _[1] < (_[2] - _[3]) / 2 ? " " : "|", 1);
}

int main(int __, char **_) {
  return (!(__ - 2) ? (___(atoi(_[1])), 0) : 1);
}