Taxes

Source: beecrowd

Version: Phuoc Hung OJ Extended

Problem Statement

Income is taxed progressively: the first 2000 is exempt, the portion over 2000 through 3000 is taxed at 8%, the portion over 3000 through 4500 at 18%, and the portion above 4500 at 28%. Each rate applies only to its corresponding income slice.

Input

One real number $S$ is the income, with at most two decimal places.

Output

If $S\le2000$, print Isento. Otherwise print R$ X.XX, where the progressive tax has exactly two digits after the decimal point.

Subtasks

Subtask 1 (20 points): Income S is in [0,2000] with at most two decimal places. Subtask 2 (30 points): Income S is in [0,4500] with at most two decimal places. Subtask 3 (50 points): Income S is in [0,100000] with at most two decimal places.

Examples

Example 1

Input

4520.00

Output

R$ 355.60

Explanation

The tax is 80 + 270 + (4520 - 4500) × 0.28 = 355.60.

Example 2

Input

2000.00

Output

Isento

Explanation

The entire income is within the exempt first 2000.