题解 | #完全数计算#

# import math

# # n = int(input())

# for n in range(1, 50001):
# # if True:
#     # n = 81
#     ans = 0
#     for i in range(1, math.floor(math.sqrt(n))+1):
#         if n % i == 0:
#             # print(i, n/i)
#             if i == n/i:
#                 ans += i
#             else:
#                 ans += i + int(n/i)
#     if ans == n * 2:
#         print(n)

arr = [6, 28, 496, 8128]
ans = 0 
n = int(input())
for i in arr:
    if n >= i:
        ans += 1

print(ans)