D = int(input())

res = D

for i in range(1,60):
    start = 0
    end = D
    while end-start>1:
        mid = (end+start)//2
        tmp = 0
        for j in range(i+1):
            tmp += mid//(2**j)
        if tmp>=D:
            end = mid
        else:
            start = mid

    tmp = 0
    for j in range(i+1):
        tmp += end//(2**j)
    if tmp==D:
        res = min(res,end)

print(res)