function binary_convert(n:number):string{
    let i:number = 0;
    let binary:string = '';
    let max:number = 0;
    
    
    while(Math.pow(2,i)<n){
        //Save the largest number for considering total length of binary
        max = i+1;
        i++;    
    }
    
    // console.log(i);
            
    // Divide it until every element is turned to binary (No remainder left)
    while(n>0 && i > 0){
            // Binary is larger or equal to remainder, modulo and add 1 to the binary string
            if(Math.pow(2,i-1)<= n){
                n = n%Math.pow(2,i-1);
                binary += '1';
            }
            // Number bigger than largest binary : skip the current binary
            else{
               binary += '0'; 
            }
            
        // Continue to smaller binary
        i--;
        }
    
    // console.log('max  =' + max)
    
    // If no remainder left, Add zeroes at the right until full length
    while(binary.length < max){
        binary += '0';
    }
    // console.log('binary = ' + binary)
    return binary
}

    public static void main(String[] args) throws IOException {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));

        int n = Integer.parseInt(bufferedReader.readLine().trim());
        
        StringBuffer strBase10 = new StringBuffer();
        int maxOnes = 0;
        int onesFound = 0;
        
        while(n>=1){
            double x = n;
            if(x%2==0){
                strBase10.append("0");
                if(onesFound>maxOnes){
                    maxOnes = onesFound;
                }
                onesFound = 0;
            }else{
                onesFound++;
                strBase10.append("1");
            }
            n = n/2;             
        }
        
        if(onesFound>maxOnes){
            maxOnes = onesFound;
        }
       
       System.out.println(maxOnes);
        
    }

function main() {
    const n = parseInt(readLine().trim(), 10);

    console.log(n.toString(2).split('0').reduce((max, str) => Math.max(max, str.length), 0));
}

import math
import os
import random
import re
import sys



if __name__ == '__main__':
    n = int(input().strip())
    binary=bin(n)[2:]
    ones=binary.split('0')
    max_ones=max(len(group) for group in ones)
    print(max_ones)