n = eval(input())for i in range(1,n): if (i==3)or(i==6)or (i==9): break else: sum +=icount=0;b= list(str(sum))for a in b: a = int(a) if (a==3)or(a==6)or(a==9): count =1if(count =0): print(sum)else: print("淘淘不会数",n)