next_happy_year

initial_year = int(input())
next_year = initial_year + 1

while True:
    new_year = ''
    for i in str(next_year):
        if i not in new_year:
            new_year += i
        else:
            continue
    if int(new_year) > initial_year:
        break
    next_year += 1

print(new_year)