Average of Ten Real Numbers

Source: Programming in C

Version: Phuoc Hung OJ Extended

Problem Statement

You are given exactly $10$ real numbers $a_0,a_1,\ldots,a_9$. Compute their arithmetic mean:

The result is judged using floating-point tolerance.

Input

One line contains exactly $10$ real numbers $a_0,a_1,\ldots,a_9$.

Output

Print one real number equal to $\overline{a}$. The answer is accepted if its absolute or relative error does not exceed $10^{-6}$.

Subtasks

Subtask 1 (100 points): $-10^6\le a_i\le10^6$; each input value has at most $6$ digits after the decimal point.

Examples

Input

1 2 3 4 5 6 7 8 9 10

Output

5.500000

Explanation

The sum is $1+2+\cdots+10=55$. There are exactly $10$ values, so the mean is $55/10=5.5$. Therefore 5.500000 is a valid output.