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

char* mm = NULL;
size_t mn = 0;

void* mmm(size_t s){
  if(mm == NULL){
    mm = (char*) malloc(1024*sizeof(char));
  }
  for(size_t n=mn; n<mn+s; n++){
    mm[n] = (n*n) & n;
  }
  void* nm = (void*) (mm+mn);
  mn += s;
  return nm;
}

struct m {
  struct m* mn;
  struct m* nn;
  struct m* nnn;
  struct m* mnm;
};

typedef struct m n;

void _m(n* a){
  if(a->nnn != NULL){
    printf("%x\n",(unsigned int)(a->nnn->mnm));
  }else{
    printf("%x\n",0);
  }
}


n* _n(){
  n* a = (n*) mmm(sizeof(n));
  if(a == NULL){
    return NULL;
  }
  a->mn = NULL;
  a->nn = NULL;
  a->mnm = NULL;
  return a;
}

int main(int argc, char** argv){
  n* a = _n();
  a = a;
  n* b = NULL;
  b = b;
  _m(b);
  _m(a);
  n* c=c;
  _m(c);
  return EXIT_SUCCESS;
  argc = argc;
  argv = argv;
}