Problem Description

The JOI Ice Cream Shop is famous for its very tall ice cream towers. An ice cream tower is made by stacking additional ice creams on top of a base ice cream, with zero or more additional ice creams.

The base ice cream costs 250 yen and has a height of $A\:\mathrm{cm}$. Each additional ice cream costs 100 yen, and each one increases the height of the ice cream tower by $B\:\mathrm{cm}$.

You want to buy an ice cream tower with a height of at least $S\:\mathrm{cm}$ from this shop. Find the minimum amount of money needed to buy an ice cream tower with a height of at least $S\:\mathrm{cm}$.

Input Format

The input is given from the standard input in the following format:

$ S $ $ A $ $ B $

Output Format

Output the minimum amount of money needed to buy an ice cream tower with a height of at least $S\:\mathrm{cm}$, omitting the unit (yen).

Sample Input and Output

Sample Input #1

28
20
5

Sample Output #1

450

Sample Input #2

1
100
1

Sample Output #2

250

Sample Input #3

100
1
1

Sample Output #3

10150

Notes/Hints

Constraints

• $1\ \leqq\ S\ \leqq\ 100$.
• $1\ \leqq\ A\ \leqq\ 100$.
• $1\ \leqq\ B\ \leqq\ 100$.
• All values given in the input are integers.

Sample Explanation 1

• If no additional ice creams are added, the height of the ice cream tower is $20\:\mathrm{cm}$ and the cost is 250 yen.
• If 1 additional ice cream is added, the height of the ice cream tower is $25\:\mathrm{cm}$ and the cost is 350 yen.
• If 2 additional ice creams are added, the height of the ice cream tower is $30\:\mathrm{cm}$ and the cost is 450 yen.

Therefore, the minimum amount of money needed to buy an ice cream tower with a height of at least $28\:\mathrm{cm}$ is 450 yen, so output 450.

见题面 Input 部分

见题面 Output 部分