def solve(array):
if len(array) == 1:
return 0
if len(array) == 2:
return 2
left = array[:len(array)//2]
right = array[len(array)//2:]
ans = max(solve(left),solve(right))
left_max = 0
left_index = 0
right_max = 0
right_index = 0
for i in range(len(left)-1,-1,-1):
if max(left_max,int(left[i])) == int(left[i]):
left_max = max(left_max,int(left[i]))
left_index = i
for i in range(0 , len(right)):
if max(right_max,int(right[i])) == int(right[i]):
right_max = max(right_max, int(right[i]))
right_index = i
ans = max(ans , right_index - left_index + 1 + len(left))
return ans
def main():
l = input().split()
print(solve(l))
main()