Hourly Parking Ticket

Source: Phước Hưng OJ

Version: Phuoc Hung OJ Extended

Problem Statement

A parking lot charges integer hours. Vehicle codes 1, 2 and 3 cost 2000, 4000 and 10000 VND per hour, respectively. Given a valid vehicle code m and a valid duration h, compute the rate multiplied by h. No opening fee or discount applies.

Input

Two integers m (vehicle code) and h (number of hours), in that order.

Output

Print the integer parking fee in VND.

Subtasks

• Subtask 1 (20%): m = 1 and 1 <= h <= 5.
• Subtask 2 (30%): 1 <= m <= 2 and 1 <= h <= 24.
• Subtask 3 (50%): 1 <= m <= 3 and 1 <= h <= 24.

Examples

Example 1

Input

1 1

Output

2000

Explanation

Type 1 costs 2000 VND/hour, so one hour costs 2000.

Example 2

Input

3 24

Output

240000

Explanation

Type 3 costs 10000 VND/hour, so 24 hours cost 240000.