import os
import sys

def is_pan(val):
    sval = str(val)
    if len(sval) == 9:
        all_nums = set(sval)

        if len(all_nums) == 9 and sorted(int(x) for x in list(all_nums)) == [1,2,3,4,5,6,7,8,9]:
            return True

    return False
def main():
    tests = xrange(10000, 1, -1)
    max = 0
    mults = [1,2]
    for test in tests:
        pan = 1
        while len(str(pan)) <= 9:
            # Add a number to our multipliers

            pan = "".join((str(test*i) for i in mults))

            if is_pan(pan):
                if pan > max:
                    max = pan

            mults.append(mults[-1] + 1)

        mults = [1,2]

    print max

if __name__ == "__main__":
    sys.exit(main())