import sys

a = int(input())
b = f'{a:b}'
# print(b)
cnt = 0
maxcnt = 0
while(a):
    if a & 1:
        cnt+=1
    else:
        if cnt > maxcnt:
            maxcnt  = cnt
        cnt = 0
    a = a >> 1
if cnt > maxcnt:
    maxcnt  = cnt
    cnt = 0
print(maxcnt)