It seems like the year of 2013 came only yesterday. Do you know a curious fact? The year of 2013 is the first year after the old 1987 with only distinct digits.

Now you are suggested to solve the following problem: given a year number, find the minimum year number which is strictly larger than the given one and has only distinct digits.
The single line contains integer *y* (1000 ≤ *y* ≤ 9000) — the year number.





y = int(input())


f = True 

ans = 0

while f :
    nxy = y + 1
    if len(set(str(nxy))) == 4:
        ans = nxy
        f = False
    else:
        y += 1
print(ans)


    
  	    				  	    	      		 		