boj_01783.py

# 2022.02.24
# Dongyoung Kwon @Chuncheonian (ehddud2468@gmail.com)
# https://www.acmicpc.net/problem/1783

N, M = map(int, input().split())

if N == 1:
    print(1)
elif N == 2:
    print(min(4, (M + 1) // 2))
else:
    if M <= 6:
        print(min(4, M))
    else:
        print(M - 2)