I need help

General
#1

You have to guess what to do by observing the follow set of tests:
INPUT OUTPUT
1 1
2 3
3 4
5 7
10 15
25 37
50 75
100 150

How can I resolve this problem?
Thanks for your supporting!

#2

It looks like you are requested to multiply the original number by 1.5 and then round down the result.

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