def egg(n):
    str_word = ''
    if n == 1:
        return '2'
    elif n == 2:
        return '3'
    elif n % 2 == 1 and n != 1:
        str_word = '2'
    elif n % 2 == 0 and n != 2:
        str_word = '3'
    return str_word + egg(int((n-1)/2))

n = int(input())
print(egg(n)[::-1])