N, K = map(int, input().split())
if K & 1:
    if N % (K+2) == 1:
        print(0)
    else:
        if K == N-1:
            print(K)
            exit()
        a = (N - 1) % (K + 2)
        if a & 1:
            print(a)
        else:
            print(a // 2)
            print(a)
else:
    if N % (K+1) == 1:
        print(0)
    else:
        a = (N - 1) % (K + 1)
        if a & 1:
            print(a)
        else:
            print(a // 2)
            print(a)