# coding: utf-8
# Your code here!

D=int(input())

MAX_BOUND=64

def calc_distance(init_power,k):
    rev=0
    for _ in range(k):
        rev+=init_power
        init_power//=2
        
    return rev

ans=10**27
for k in range(MAX_BOUND):
    high=D+1
    low=-1
    
    while high-low>1:
        middle=(high+low)//2
        
        distance=calc_distance(middle,k)
        
        if distance>=D:
            high=middle
        else:
            low=middle
    
    if calc_distance(high,k)==D:
        ans=min(ans,high)

print(ans)