task-113316.py

def parse_args():
    nk = list(map(int, input().split(' ')))
    return nk[0], nk[1]


def modify(arr, tmp, n):
    for i in range(0, n):
        if arr[i]:
            ip = (i + 1) % n
            im = (i + n - 1) % n
            tmp[ip] = 1
            tmp[im] = 1
    for i in range(0, n):
        arr[i] = tmp[i]
        tmp[i] = 0
    return arr

if __name__ == "__main__":
    n, k = parse_args()
    arr = [1] + [0] * (n - 1)
    tmp = [0] * n
    for k in range(0, k):
        # print(list(map(int, arr)))
        arr = modify(arr, tmp, n)
    # print(list(map(int, brr)))
    m = sum(map(int, arr))
    print(m)