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

int main(int argc, char**argv){

  FILE* pp;
  if((pp = popen("ls", "r")) == NULL) {
    perror("popen");
    exit(1);
  }

  char plop[1024];

  int i=0;
  while(fscanf(pp, "%s\n", plop) != EOF) {
    i++;
  }

  printf("%d \n", i);

  pclose(pp);

  return 0;
}