1897.Kids' Riddle

Time Limit: 1s Memory Limit: 256MB

Programmers' kids solve this riddle in 5-10 minutes. How fast can you do it?

Input Format(From the terminal/stdin)

The input contains a single integer n (0 \le n \le 2000000000).

Output Format(To the terminal/stdout)

Output a single integer.

Sample Input 1

Copy 
11
  \n

Sample Output 1

Copy 
2
 \n

Sample Input 2

Copy 
14
  \n

Sample Output 2

Copy 
0
 \n

Sample Input 3

Copy 
61441
     \n

Sample Output 3

Copy 
2
 \n

Sample Input 4

Copy 
571576
      \n

Sample Output 4

Copy 
10
  \n

Sample Input 5

Copy 
2128506
       \n

Sample Output 5

Copy 
3
 \n

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