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## Problem Description

In many programming algorithms, 'log n' is a common term in its complexity analysis. What does 'log n' mean? In the context of programming algorithms, it means "log n to the base of 2".
So what is 'log'? 'log base 2' means how many times a number can be divided by 2. 'log base 3' means how many times a number can be divided by 3.. and so on. (Eg log_{2} 8 = 3, log_{3} 9 = 2).

Your task is to find out how many times a number can be divided (using integer division) by 2 before it is less than 2.

## Input

Consists a single integer, which is not more than 1000000000.

## Output

A single integer, which is how many times a number can be divided by 2 before it is less than 2.

## Sample Input

3

## Sample Output

1

### Tags

### Subtasks and Limits

Subtask | Score | #TC | Time | Memory | Scoring |
---|---|---|---|---|---|

1 | 100 | 10 | 1s | 32MB | Average |

2 | 0 | 1 | 1s | 32MB | Average |

### Judge Compile Command

g++-7 ans.cpp -o log2 -Wall -static -O2 -lm -m64 -s -w -std=gnu++17 -fmax-errors=512