n = int(input())

if n % 3 == 0:
    n -= 1

n = list(str(n))

for i in range(len(n)):
    if n[i] == "3":
        n[i] = "2"
        for j in range(i+1, len(n)):
            n[j] = "9"

n = "".join(n)
n = int(n)
if n % 3 == 0:
    n -= 1

print(n)