year = input()
year_as_int = int(year) + 1
year = str(year_as_int)

while True:
    symbols_count = len(year)
    unique_counts = len(set(year))

    if symbols_count == unique_counts:
        break
    else:
        year_as_int += 1
        year = str(year_as_int)
print(year)