shiracamus

import sys
import random


def show_maze(maze):
    print()
    for row in maze:
        print(' ', *row, sep='')

shiracamus

from ipaddress import IPv4Address, IPv4Network, AddressValueError


def read_lines(filename):
    try:
        with open(filename) as f:
            return f.read().splitlines()
    except IOError:
        print(f"Error: {filename}が開けない")
        exit()

shiracamus

import random


class Card:
    RANKS = "A23456789TJQK"

    def __init__(self, rank):
        self.rank = rank if rank != "T" else "10"
        self.number = Card.RANKS.index(rank) + 1

shiracamus

from pprint import pprint

def sign(i):
    return (+1, -1)[i & 1]

def cof(matrix, y, x):
    return [[value for c, value in enumerate(row) if x != c]
            for r, row in enumerate(matrix) if y != r]

def det(matrix):

shiracamus

import tkinter as tk
import random

HANDS = ROCK, SCISSORS, PAPER = "グー", "チョキ", "パー"
WIN, LOSE, DRAW = "勝ち", "負け", "引き分け"


class Player:
    STRONGER_THAN = {ROCK: PAPER, SCISSORS: ROCK, PAPER: SCISSORS}

shiracamus

import time

class Hanoi:

    def __init__(self, n):
        self.n = n
        self.tower = list(range(1, n+1))[::-1], [], []

    def solve(self):
        yield from self.move(self.n, 0, 1, 2)

shiracamus

import tkinter as tk
import math


class Board:

    def __init__(self, divide, top=90):
        self.divide = divide
        self.top = top
        self.offset = top - 360 // divide // 2

shiracamus

class Board:

    def __init__(self, size, space=None):
        self.cells = [[space] * size for i in range(size)]
        self.space = space

    def __iter__(self):
        return (tuple(row) for row in self.cells)

    def __getitem__(self, pos):

shiracamus

N, M = map(int, input().split())
a = {int(input()) for i in range(M)}
n, m = 1, 0
for i in range(1, N + 1):
    n, m = (i not in a) * (n + m) % 1000000007, n
print(n)

shiracamus

class Bottle:

    def __init__(self, capacity, water):
        self.capacity = capacity
        self.water = water

    def __repr__(self):
        return repr(self.water)

    def __eq__(self, water):