import sys
sys.set_int_max_str_digits(0)


def main():
    s = list(input())
    while 1:
        ok = True
        f = False
        for i, c in enumerate(s):
            if f:
                s[i] = "9"
            elif c=="3":
                f = True
                s[i] = "2"
                ok = False
        if ok:
            x = int("".join(s))
            if x%3:
                break
            else:
                x -= 1
                s = list(str(x))
    print("".join(s))


if __name__ == "__main__":
    main()