import sys
input = sys.stdin.readline
def iinput(): return int(input())
def sinput(): return input().rstrip()
def i0input(): return int(input()) - 1
def linput(): return list(input().split())
def liinput(): return list(map(int, input().split()))
def miinput(): return map(int, input().split())
def li0input(): return list(map(lambda x: int(x) - 1, input().split()))
def mi0input(): return map(lambda x: int(x) - 1, input().split())
INF = 10**20
MOD = 1000000007

N, K = liinput()
if N == 1:
    print(1)
elif N == 2:
    if K == 1:
        print(2)
    else:
        print(1)
else:
    if K == N - 1:
        print(N)
    else:
        print(N - 1)