def calc(n):
    if n % 3 == 0:
        n -= 1

    digits = []
    found = False
    for d in str(n):
        if not found and d == '3':
            digits.append('2')
            found = True
        elif found:
            digits.append('9')
        else:
            digits.append(d)

    n = int(''.join(digits))
    if n % 3 == 0:
        n -= 1
    return n

n = int(input())
print(calc(n))