import sys
input = lambda : sys.stdin.readline().rstrip()
sys.setrecursionlimit(max(1000, 10**9))
write = lambda x: sys.stdout.write(x+"\n")


d = int(input())
ans = d
def sub(x, k):
    v = 0
    i = 0
    while x>0:
        v += x
        x //= 2
        i += 1
        if i>=k:
            break
    return v>=d
def val(x, k):
    v = 0
    i = 0
    while x>0:
        v += x
        x //= 2
        i += 1
        if i>=k:
            break
    return v

def proc(k):
    l = 0
    r = d
    while l<r-1:
        m = (l+r)//2
        if sub(m,k):
            r = m
        else:
            l = m
    if val(m,k)==d:
        return m
    else:
        return None
for v in range(2,100):
    tmp = proc(v)
    if tmp is not None:
        ans = min(ans, tmp)
print(ans)