import sys
sys.set_int_max_str_digits(0)

N = input()
L = len(N)

if int(N[0]) < 4:
    ans = ['5']*(L - 1)
    exit(print(''.join(ans)))
elif int(N[0]) > 5:
    ans = ['5']*(L)
    exit(print(''.join(ans)))

ans = []
five = False
for i in range(L):
    nokori = L - i
    n = int(N[i])
    if n > 5:
        for _ in range(nokori):
            ans.append('5')
        break

    elif n < 4:
        cnt = 0
        while ans:
            rm = ans.pop()
            if rm == '5':
                five = True
                ans.append('4')
                break
            else:
                cnt += 1

        # cnt 分 ５ を入れる
        if not five:
            cnt -= 1
        for _ in range(cnt + nokori):
            ans.append('5')
        break

    else:
        ans.append(str(n))

print(''.join(ans))