unsigned int cicl(unsigned int n)
{
  unsigned int counter;
  int result;
  int var;

  if (n == 0) {
    result = 0;
  }
  else {
    if (n == 1) {
      result = 1;
    }
    else {
      var = 0;
      result = 1;
      counter = 2;
      while (counter <= n + 1) {
        result = result + var;
        var = result - var;
        counter = counter + 1;
      }
    }
  }
  return result;
}