Competitions

# 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.

Time limit 1 second
Memory limit 128 MiB
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