#include <stdio.h>
#include <stdlib.h>

int main(void) {
  int a = 1, b = 2, c = 3, d = 4;
  int *p1 = &a, **p2 = &p1, *p3 = &c, *p4 = &b, **p5 = &p3, *p6 = &d;

  *p3  = **p2 + 6;
  *p2  = p3;
  *p1  = *p4 * 5;
  p5   = &p6;
  **p5 = **p5 + **p2;
  *p4  = *p3 + 14;
  *p5  = p1;
  **p2 = 1 + **p2;
  **p5 = **p5 * **p2;

  printf("a, b ,c and d are equal to: %d, %d, %d and %d\n", a, b, c, d);
  return 1;
}