Ticket Vending Machine

Source: Phước Hưng OJ

Version: Phuoc Hung OJ Extended

Problem Statement

A vending machine sells five ticket types numbered 1 to 5. Their unit prices are 15, 20, 25, 30 and 40 monetary units. Given the selected type and quantity, output the total price.

Input

One line contains integers ma and so_luong, the ticket type and quantity.

Output

Print the unit price for the selected ticket type multiplied by the quantity.

Subtasks

• Subtask 1 (20%): 1 <= ma <= 2 and 1 <= so_luong <= 10.
• Subtask 2 (30%): 1 <= ma <= 4 and 1 <= so_luong <= 100.
• Subtask 3 (50%): 1 <= ma <= 5 and 1 <= so_luong <= 1000.

Examples

Example 1

Input

2 3

Output

60

Explanation

Ticket type 2 costs 20 each; three tickets cost 60.

Example 2

Input

5 1000

Output

40000

Explanation

Type 5 costs 40 each, so 1000 tickets cost 40000.