text: #include <stdint.h>
  
  int gauss_ref(int n) {
  	return n*2;
    /*if (n == 1)
      return 1;
    return gauss_ref(n-1) + 1;*/
  }
  
  int gauss_closed(int n) {
  	int y = n*2;
  	return y;
    //return n * (n + 1) /2;
  }
  