#include<stdio.h>
void main()
{
	int i,n,c=0;
	scanf("%d",&n);
	if(n%2==0){
		while(n%2==0){
			c+=1;
			n/=2;
			
		}
		printf("%d",c);
	}else{
		printf("%d",0);
	}
} 
/**************************************************************
	Problem: 1244
	User: admin
	Language: C
	Result: Accepted
	Time:10 ms
	Memory:1144 kb
****************************************************************/