Problems

# Arithmetical mean

# Arithmetical mean

The sequence of integers is given. Find its arithmetical mean.

#### Input

In one line the integers are given, each of the numbers is no more than **100** by absolute value.

#### Output

Print the arithmetical mean of all elements in the sequence. Print the answer with **4** decimal digits.

Input example #1

1 2 3 4 5

Output example #1

3.0000

Input example #2

5 5 7 1 2 9

Output example #2

4.8333