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Problems

Arithmetical mean

Arithmetical mean

Time limit 1 second
Memory limit 128 MiB

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

Input data

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

Output data

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

Examples

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