N = input()


def solve():
    digits = [int(c) for c in N]

    if digits[0] < 4:
        return [5] * (len(digits) - 1)

    lt = False
    st = []
    for d in digits:
        if lt:
            st.append(5)
            continue

        if d > 5:
            lt = True
            st.append(5)
        elif d >= 4:
            st.append(d)
        else:
            n = len(st)
            while st and st[-1] == 4:
                st.pop()

            if len(st) == 0:
                st = [5] * (n-1)
                lt = True
            else:
                assert st[-1] == 5
                st.pop()
                st.append(4)
                st.extend([5] * (n - len(st)))
                st.append(5)
                lt = True

    return st


ans = solve()
print(*ans, sep='')