#include <stdio.h>
#include <time.h>

int main()
{
  char outstr[200];
  time_t t;
  struct tm *tmp;
  t = time(NULL);
  t = t - (24*60*60);
  tmp = localtime(&t);
  strftime(outstr, sizeof(outstr), "%Y%m%d", tmp);
  printf( outstr );
  return 0;
}