def solve(s: str):
    n = len(s)
    digits = [int(c) for c in s]

    ind = -1
    for i, d in enumerate(digits):
        if d == 5:
            ind = i

        if d > 5:
            hd = digits[:i]
            tl = [5] * (n - i)
            return hd + tl
        elif d < 4:
            if ind == -1:  # 先頭桁から i 桁目までに 5 は存在しない
                return [5] * (n-1)

            hd = digits[:ind] + [4]
            tl = [5] * (n - ind - 1)
            return hd + tl

    return digits


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