Shipping Code and Discount

Source: Phước Hưng OJ

Version: Phuoc Hung OJ Extended

Problem Statement

A delivery service has item codes 1, 2 and 3 with unit prices 10, 20 and 30, respectively. A customer orders q items of one code. Compute unit price times q; if q >= 5, apply a 10% discount to the entire total. If the code is not 1, 2 or 3, print INVALID and do not compute a price. The result is an integer.

Input

Two integers k (item code) and q (number of items).

Output

Print the integer total for a valid code, or exactly INVALID otherwise.

Subtasks

• Subtask 1 (20%): k = 1 and 1 <= q <= 4.
• Subtask 2 (30%): 1 <= k <= 3 and 1 <= q <= 4.
• Subtask 3 (50%): -10 <= k <= 10 and 1 <= q <= 100.

Examples

Example 1

Input

2 5

Output

90

Explanation

Code 2 costs 20 each: 5 items cost 100. The 10% discount is 10, leaving 90.

Example 2

Input

1 4

Output

40

Explanation

Four type-1 items cost 40, with no discount.

Example 3

Input

7 10

Output

INVALID

Explanation

Code 7 is invalid regardless of the quantity.