Competitions

# Lesson 4. September 24 - 30. Loops: while statement

# Transformation

Lets take some positive integer **n**. We shall change it nest way: if number is even, divide it by **2**, if odd, add **1** to it. After several such changes we always get the number **1**. For example, from number **11** we get **12**, then **6**, **3**, **4**, **2** and at last **1**. So in order to get **1** from **11** we need to make **6** changes.

Given a positive integer, find the number of its changes to get **1**.

#### Input

One positive integer **n** (**1** ≤ **n** ≤ `10`

).^{9}

#### Output

Print the number of changes for **n** to get **1**.

Input example #1

11

Output example #1

6