mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

    N, K = map(int, input().split())
    if N == 1:
        print(1)
        exit()
    if K == N - 1:
        print(N)
    else:
        print(N-1)


if __name__ == '__main__':
    main()