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.
# 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.

# Input
# The single line contains integer y (1000 ≤ y ≤ 9000) — the year number.

# Output
# Print a single integer — the minimum year number that is strictly larger than y and all it's digits are distinct. It is guaranteed that the answer exists.

# Examples
# input
# 1987
# output
# 2013
# input
# 2013
# output
# 2014


y = int(input())
target = y
while True:
    digits_10 = [0] * 10
    target +=1
    temp = target
    # extracting the last digit
    while temp > 0:
        digit = temp % 10
        digits_10[digit] += 1
        temp //= 10 # floor division, remove the last digit, shift everything 1 position to the right
    
    # check if all digits are unique
    # route 1
    if all(x <= 1 for x in digits_10):
        break
    

print(target)