if __name__ == '__main__':
n = int(input().strip())
a = list(bin(n)[2:])
c = [-1]
d = []
for i in range(len(a)):
if a[i] == "0":
c.append(i)
c.append(len(a)) 
for i in range(len(c)-1):
d.append(c[i+1] - (c[i]+1)) 
print(max(set(d)))