# Degree of two

Very easy

Execution time limit is 1 second

Runtime memory usage limit is 128 megabytes

n degrees of number 2 are written sequentially in a line, i.e. the numbers from 2 to `2^n`

without spaces. Find the value of n.

## Input

n (1 ≤ n ≤ 1000) degrees of number 2 are written sequentially in a line.

## Output

Print the value of n.

## Examples

Input #1

Answer #1

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