# The ratio of product to the sum

Very easy

Execution time limit is 1 second

Runtime memory usage limit is 128 megabytes

Find the ratio of the product of digits of natural number to their sum.

## Input

One positive integer n, not greater than 2 ·`10^9`

.

## Output

The desired ratio, calculated with 3 decimal digits.

## Examples

Input #1

Answer #1

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