def cbit(bits):
    bits = (bits & 0x55555555) + (bits >> 1 & 0x55555555);
    bits = (bits & 0x33333333) + (bits >> 2 & 0x33333333);
    bits = (bits & 0x0f0f0f0f) + (bits >> 4 & 0x0f0f0f0f);
    bits = (bits & 0x00ff00ff) + (bits >> 8 & 0x00ff00ff);
    return (bits & 0x0000ffff) + (bits >>16 & 0x0000ffff);
n = int(input())
if(n==1):
    print(-1);
    quit();
oc = -1;
c = 0
m = 1;
while(1):
    s = cbit(m);
    m += s;
    c += s;
    if (m > n):
        if (s == cbit(m)):
            print(-1);
            break;
        elif (oc == 10):
            print(-1);
            break;
        oc = oc + 1;
        m = m - s*2;
    elif (m == n):
        print(c);
        break;