Competitions

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

# Ones

At informatics lessons you have probably been taught to transform the numbers from one number system to another, and to perform other similar operations. It's time to demonstrate this knowledge. Find the number of ones in binary representation of a number.

#### Input

One integer **n** (**0** ≤ **n** ≤ **2** ∙`10`

).^{9}

#### Output

Print the number of ones in binary representation of **n**.

Input example #1

5

Output example #1

2

Input example #2

7

Output example #2

3