58. Parking Fee Calculation

Difficulty: easy · Math, String

Problem

A parking lot charges by the hour using tiered rates: - each of the first 2 hours: ₹100 - each of hours 3 to 5: ₹50 - each hour beyond 5: ₹20 For example, 6 hours cost `2*100 + 3*50 + 1*20 = 370`. The input is the number of hours as typed by the user. If it is not a non-negative whole number (for example `SIX`, `2.5` or `-3`), print `ERROR`.

Input

A single line containing the hours as text.

Output

Print the total fee as an integer, or `ERROR`.

Example 1

Input:
2
Output:
200

Explanation: Both hours are in the first tier: 2 * 100 = 200.

Example 2

Input:
6
Output:
370

Explanation: 2*100 + 3*50 + 1*20 = 370.

Example 3

Input:
SIX
Output:
ERROR

Explanation: The input is not a number, so ERROR.

Constraints

- The line has 1 to 20 characters with no spaces - When valid, 0 <= hours <= 10^9

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