D = int(input())
ok = pow(10,20)
ng = 0

def check(x,loop):
    ret = x
    for i in range(loop):
        x = x//2
        ret += x
    return ret

#print(check(5,1))
ans = float("inf")
MAX = 70
for i in range(MAX):
    ok = pow(10,20)
    ng = 0
    while abs(ok-ng) > 1: #and cnt < 100:
        mid = (ok+ng)//2
        #print(ok,mid,ng)
        if check(mid,i) >= D:
            ok = mid
        else:
            ng = mid
    #print(ok,check(ok,i))
    if check(ok,i) == D:
        ans = min(ans,ok)

print(ans)