boj_1783_greedy.py

import sys

n, m = list(map(int, sys.stdin.readline().rstrip().split(" ")))

if n == 1:
    print(1)
elif n == 2:
    if m >= 7:
        print(4)
    else:
        print((m + 1) // 2)
else:
    if m <= 4:
        print(m)
    elif m == 5:
        print(4)
    else:
        print(m - 2)