Weighted Average Grade

Version: Phuoc Hung OJ Extended

Problem Statement

Given three grades $a$, $b$ and $c$ on a 10-point scale, with weights $20\%$, $30\%$ and $50\%$ respectively, compute the weighted mean $M=0.2a+0.3b+0.5c$. Print exactly 2 decimal places.

Input

The only line contains three real grades $a$, $b$, $c$, in that order.

Output

Print weighted mean $M$ with exactly 2 decimal places.

Subtasks

• Subtask 1 (100 points): $0\le a,b,c\le10$.

Examples

Example 1

Input

8 7 9

Output

8.20

Explanation. Substituting 8, 7, 9 into 0.2 × a + 0.3 × b + 0.5 × c gives approximately 8.2. The required output formatting produces 8.20.

Example 2

Input

10 10 10

Output

10.00

Explanation. Substituting 10, 10, 10 into 0.2 × a + 0.3 × b + 0.5 × c gives approximately 10. The required output formatting produces 10.00.

Example 3

Input

5.5 6.5 7.5

Output

6.80

Explanation. Substituting 5.5, 6.5, 7.5 into 0.2 × a + 0.3 × b + 0.5 × c gives approximately 6.8. The required output formatting produces 6.80.