d=int(input())
def distance(x):
    res=0
    while x>0:
        res+=x
        x//=2
        if res>=d:
            break
    return res
for i in range(100,0,-1):
    t=d*(2**(i-1))//(2**i-1)
    for j in range(-50,50):
        if t+j<0:
            continue
        if distance(t+j)==d:
            print(t+j)
            exit()