#include <iostream>
#include <bitset>
#include <math.h>
using namespace std;
int N = 0;
int toiDa = 0;
int main(){
	int soHe10;
	cin >> soHe10;
	bitset<21> chuyenBinary(soHe10); //chuyen tu interger -> binary
	for (int soTruoc = 0;soTruoc  <= 21;soTruoc += 1)		{
		if(chuyenBinary[soTruoc] == 1){ //count if = 1
			N += 1;
		}
		else if(toiDa < N && chuyenBinary[soTruoc] == 0){ //reset if = 0 and set toi da
			toiDa = N ;
			N = 0;
		}
		else{ //deo can` thiet :))
			N = 0;
 			}
	}
	cout << toiDa;
}