Лимит времени 2000/4000/4000/4000 мс. Лимит памяти 65000/65000/65000/65000 Кб.  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.
 Для отправки решений необходимо выполнить вход.
  
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