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.



def i():
    return(int(input()))
def l():
    return(list(map(int,input().split())))
def s():
    s = input()
    return(s)
def sl():
    s = input()
    return(list(s[:len(s) - 1]))
def m():
    return(map(int,input().split()))


n = i()
n += 1

while len(set(str(n))) < 4:
    n += 1
print(n)