#include<iostream>
#include<math.h>
using namespace std;
int main()
{
    int input;
    while(cin>>input)
    {
        int result = 0;
        int tmp = 0;
        for(int i=0; i<9; i++)
        {
            if(input&1 == 1)
            {
                tmp++;
            }
            else
            {
                if(tmp>result)
                {
                    result = tmp;
                    //cout<<result<<endl;
                }
                tmp = 0;
            }
            input = input>>1; // floor(input/2);
        }
        cout<<result<<endl;
    }
    return 0;
}