D = int(input())

def check(n,rep):
    now = n
    SUM = 0
    for _ in range(rep):
        SUM += now
        now //= 2
    return SUM >= D

for repeat in range(60,-1,-1):
    ng,ok = 0,10**18
    while(ok - ng > 1):
        mid = (ok+ng)//2
        if(check(mid,repeat)):
            ok = mid
        else:
            ng = mid

    now = ok
    SUM = 0
    for _ in range(repeat):
        SUM += now
        now //= 2
    if(SUM == D):
        print(ok)
        exit()