import math

n = int(input())

normal_list = []
cumula_list = [] # cumulative_list
skill_list = []
cur = n

while True:
    normal_list.append(cur)
    cur = cur // 2
    if cur < 1:
        break

for i in range(len(normal_list)):
    if i == 0:
        cumula_list.append(normal_list[i])
    else:
        cumula_list.append(cumula_list[i - 1] + normal_list[i])
        
for i in range(len(normal_list)):
    if i == 0:
        skill_list.append(2 * cumula_list[i])
    else:
        skill_list.append(cumula_list[i - 1] + 2 * normal_list[i])
        
print(max(skill_list) - cumula_list[len(cumula_list) - 1])