import sys
# input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################
"""
4449
0555

4549
4455

"""
n = input()

ok = -1
for i in range(len(n)):
    if n[i] != "4" and n[i] != "5":
        if int(n[i]) < 4:
            ok = 0
        else:
            ok = 1
        z = i
        break
# print(ok)
if ok == -1:
    print(n)
elif ok:
    print(n[:z] + "5" * (len(n) - z))
else:
    y = -1
    for i in range(z-1, -1, -1):
        if n[i] == "5":
            y = i
            break
    if y == -1:
        print("5" * (len(n) - 1))
    else:
        print(n[:y] + "4" + "5" * (len(n) - y - 1))