def encodedate (day, month, year):
    x = 0
    if month > 0 and month <=12:
        x = (x & 0x0FFFFFFF) | ((month - 1) << 28)
    else:
        return -1

    if day <= 31 or day > 0:
        x = (x & 0x0FFFFFF) | (day << 23)

    else:
        return -1

    if year > 0 and year <= 2**23 -1:
        x = (x & 0x7FFFF) | year
    return x

print(encodedate(5,5,2017))