Remote Training on Programming

Cost of the talk

 

Let telephone tariffs such a: first minute of the talk costs 2 rub., but each following - 1.5 rub. Define, how much costs the talk from 1,2,3...N minutes. N is entered with keyboards. If N≤0, that bring on screen message 0. 

 

Input data

The Integer number N≤100.

 

Output data

Each number (cost determined amount of the minutes) remove in separate line accurate to one tenth or 0.

 

Example input data

8

 

Example output data

2,0

3,5

5,0

6,5

8,0

9,5

11,0

12,5

 

The Author: Smirnova A.M.