def min_moves(Gx, Gy):
    # 检查 Gx 和 Gy 的奇偶性
    if Gx == 0 and Gy == 0:
        return 0
    elif (Gx % 2 == 0 and Gy % 2 == 0) or (Gx % 2 == 1 and Gy % 2 == 1):
        return 1
    else:
        return 2

# 读取输入
Gx, Gy = map(int, input().split())

# 计算并输出最小步数
print(min_moves(Gx, Gy))