#めぐる式二部探索
#参考サイト：https://aotamasaki.hatenablog.com/entry/meguru_bisect

D = int(input())
def is_ok(arg):
    jump = 0
    while arg>0:
        jump += arg
        arg = arg//2
    return jump >= D

def meguru_bisect(ng, ok):
    while (abs(ok - ng) > 1):
        mid = (ok + ng) // 2
        if is_ok(mid):
            ok = mid
        else:
            ng = mid
    return ok
ans = meguru_bisect(0,10**18 + 1)

jump = 0
anstemp = ans
while anstemp >0:
    jump += anstemp
    anstemp = anstemp//2

if jump>ans: 
    ans+=1

print(ans)