#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>

int main(int argc, char* argv[]){
    int p = 0;
    int status=0;
    int x = 1;

    p = fork();
    if ( p != 0 ) {
         wait(&status);
         printf(" x: %d\n", x);
         p = fork();
         if ( p==0 ){
            x--;
            printf(" x: %d\n", x);
            execl( "/bin/ls" , "ls", NULL );
        }
    } else {
        x = 3;
        printf(" x: %d\n", x);
        exit( 0 );
    }
    wait(&status);
    printf(" x: %d\n", x);
}