#include <stdio.h>

int main() 
{
    int n,c=0;
    printf("enter a number:\n");
    scanf("%d",&n);

    if(n%2==1)
    {
        do {
                n=n/2;
                c++;
            }
        while (n!=1);
        
    }
    printf("%d",c);
        
    
    return 0;
}