#include <stdio.h>
#include <string.h>

int main()
{
  int n, cnt = 0, i;
  char s[30];
  printf("n = ");
  scanf("%d", &n);
  for ( i = 1; i <= n; ++i) {
    sprintf(s, "%d", i);
    cnt += (strchr(s, '3') == NULL) && (strchr(s, '5') == NULL);
  }
  printf("%d\n", cnt);
  return 0;
}