Sightseeing trip
Very easy
Execution time limit is 1 second
Runtime memory usage limit is 128 megabytes
The pupils from 10-B class decided in the autumn holiday to go on an excursion to the capital. Knowing the number of boys and girls , determine how many rooms you need to book in a hotel, if each room has beds and it is forbidden to settle boys and girls together.
Input
One line contains three numbers .
Output
Print the number of rooms to book in the hotel.
Examples
Input #1
Answer #1
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