def main():
    n = list(int(c) for c in input())
    for i in range(len(n)):
        if n[i] == 3:
            n[i] = 2
            for j in range(i + 1, len(n)):
                n[j] = 9
            break
    total = sum(n)
    while total % 3 == 0:
        if n[-1] > 0:
            if n[-1] == 4:
                n[-1] = 2
                total -= 2
            else:
                n[-1] -= 1
                total -= 1
        else:
            i = len(n) - 1
            while n[i] == 0:
                n[i] = 9
                total += 9
                i -= 1
            if n[i] == 4:
                n[i] = 2
                total -= 2
            else:
                n[i] -= 1
                total -= 1
    for x in n:
        print(x, end='')
    print()


if __name__ == '__main__':
    main()