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50799 - OSHEE Electric Bill

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Time limit 2000/4000/4000/4000 ms. Memory limit 65000/65000/65000/65000 Kb.
Question by Ibrahim Mesecan.

OSHEE Electric Bill

OSHEE calculates the electric bills for home use as follows:

The first 300kWh is 7lek per kWh
Above 300kWh: 13lek per each additional kWh

Question: Write full program (C or C++) that gets the previous amount and current amount in kW. Then, calculate amount due from the user.

Input specification
You will be given two integers: previous (pa) and current (ca) amounts in kWh where 0 ≤ pa ≤ ca ≤ 25,000.

Output specification
Show just one number: the amount due from the user.

Sample Input 1 `1000 1400`	Sample Input 2 `2400 2600`
Sample Output 1 `3400`	Sample Output 2 `1400`

Explanation: The final hour is 1400 so he has used (1400-1000) 400kWh in this month. The first 300kWh is from 7 leke (2100) and extra 100kWh is from 13 leke (1300) and the total is 3400 leke.

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