import java.io.*;
import java.util.Arrays;
import java.util.StringTokenizer;

public class Main
{
    static long[] dp;
    static int N,M;
    static final int MOD = 1000000007;
    public static void main(String[] args) throws IOException
    {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        StringTokenizer st = new StringTokenizer(br.readLine());
        N = Integer.parseInt(st.nextToken());
        M = Integer.parseInt(st.nextToken());
        dp = new long[N+1];
        Arrays.fill(dp,-1);
        dp[0] = 1; dp[1] = 1;
        for(int i=0;i<M;++i)
        {
            dp[Integer.parseInt(br.readLine())] = 0;
        }
        for(int i=0;i<=N;++i)
        {
            if(dp[i]!=-1) continue;
            dp[i] = (dp[i-1]+dp[i-2])%MOD;
        }
        bw.write(dp[N]+"");
        bw.close();
    }

} import java.io.*; io.* java import java.util.Arrays; Arrays java.util import java.util.StringTokenizer; StringTokenizer java.util public class Main
{
    static long[] dp;
    static int N,M;
    static final int MOD = 1000000007;
    public static void main(String[] args) throws IOException
    {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        StringTokenizer st = new StringTokenizer(br.readLine());
        N = Integer.parseInt(st.nextToken());
        M = Integer.parseInt(st.nextToken());
        dp = new long[N+1];
        Arrays.fill(dp,-1);
        dp[0] = 1; dp[1] = 1;
        for(int i=0;i<M;++i)
        {
            dp[Integer.parseInt(br.readLine())] = 0;
        }
        for(int i=0;i<=N;++i)
        {
            if(dp[i]!=-1) continue;
            dp[i] = (dp[i-1]+dp[i-2])%MOD;
        }
        bw.write(dp[N]+"");
        bw.close();
    }

} Main static long[] dp; dp static int N N M; M static final int MOD = 1000000007; MOD 1000000007 public static void main(String[] args) throws IOException
    {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        StringTokenizer st = new StringTokenizer(br.readLine());
        N = Integer.parseInt(st.nextToken());
        M = Integer.parseInt(st.nextToken());
        dp = new long[N+1];
        Arrays.fill(dp,-1);
        dp[0] = 1; dp[1] = 1;
        for(int i=0;i<M;++i)
        {
            dp[Integer.parseInt(br.readLine())] = 0;
        }
        for(int i=0;i<=N;++i)
        {
            if(dp[i]!=-1) continue;
            dp[i] = (dp[i-1]+dp[i-2])%MOD;
        }
        bw.write(dp[N]+"");
        bw.close();
    } main {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        StringTokenizer st = new StringTokenizer(br.readLine());
        N = Integer.parseInt(st.nextToken());
        M = Integer.parseInt(st.nextToken());
        dp = new long[N+1];
        Arrays.fill(dp,-1);
        dp[0] = 1; dp[1] = 1;
        for(int i=0;i<M;++i)
        {
            dp[Integer.parseInt(br.readLine())] = 0;
        }
        for(int i=0;i<=N;++i)
        {
            if(dp[i]!=-1) continue;
            dp[i] = (dp[i-1]+dp[i-2])%MOD;
        }
        bw.write(dp[N]+"");
        bw.close();
    } BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); br new BufferedReader(new InputStreamReader(System.in)) BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out)); bw new BufferedWriter(new OutputStreamWriter(System.out)) StringTokenizer st = new StringTokenizer(br.readLine()); st new StringTokenizer(br.readLine()) N = Integer.parseInt(st.nextToken()) N Integer.parseInt(st.nextToken()) Integer.parseInt Integer st.nextToken() st.nextToken st M = Integer.parseInt(st.nextToken()) M Integer.parseInt(st.nextToken()) Integer.parseInt Integer st.nextToken() st.nextToken st dp = new long[N+1] dp new long[N+1] N+1 N 1 Arrays.fill(dp,-1) Arrays.fill Arrays dp -1 1 dp[0] = 1 dp[0] dp 0 1 dp[1] = 1 dp[1] dp 1 1 for(int i=0;i<M;++i)
        {
            dp[Integer.parseInt(br.readLine())] = 0;
        } int i=0; int i=0; i 0 i<M i M ++i ++i i {
            dp[Integer.parseInt(br.readLine())] = 0;
        } {
            dp[Integer.parseInt(br.readLine())] = 0;
        } dp[Integer.parseInt(br.readLine())] = 0 dp[Integer.parseInt(br.readLine())] dp Integer.parseInt(br.readLine()) Integer.parseInt Integer br.readLine() br.readLine br 0 for(int i=0;i<=N;++i)
        {
            if(dp[i]!=-1) continue;
            dp[i] = (dp[i-1]+dp[i-2])%MOD;
        } int i=0; int i=0; i 0 i<=N i N ++i ++i i {
            if(dp[i]!=-1) continue;
            dp[i] = (dp[i-1]+dp[i-2])%MOD;
        } {
            if(dp[i]!=-1) continue;
            dp[i] = (dp[i-1]+dp[i-2])%MOD;
        } if(dp[i]!=-1) continue; dp[i]!=-1 dp[i] dp i -1 1 continue; dp[i] = (dp[i-1]+dp[i-2])%MOD dp[i] dp i (dp[i-1]+dp[i-2])%MOD (dp[i-1]+dp[i-2]) dp[i-1] dp i-1 i 1 dp[i-2] dp i-2 i 2 MOD bw.write(dp[N]+"") bw.write bw dp[N]+"" dp[N] dp N "" bw.close() bw.close bw String[] args args public class Main
{
    static long[] dp;
    static int N,M;
    static final int MOD = 1000000007;
    public static void main(String[] args) throws IOException
    {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        StringTokenizer st = new StringTokenizer(br.readLine());
        N = Integer.parseInt(st.nextToken());
        M = Integer.parseInt(st.nextToken());
        dp = new long[N+1];
        Arrays.fill(dp,-1);
        dp[0] = 1; dp[1] = 1;
        for(int i=0;i<M;++i)
        {
            dp[Integer.parseInt(br.readLine())] = 0;
        }
        for(int i=0;i<=N;++i)
        {
            if(dp[i]!=-1) continue;
            dp[i] = (dp[i-1]+dp[i-2])%MOD;
        }
        bw.write(dp[N]+"");
        bw.close();
    }

} public class Main
{
    static long[] dp;
    static int N,M;
    static final int MOD = 1000000007;
    public static void main(String[] args) throws IOException
    {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        StringTokenizer st = new StringTokenizer(br.readLine());
        N = Integer.parseInt(st.nextToken());
        M = Integer.parseInt(st.nextToken());
        dp = new long[N+1];
        Arrays.fill(dp,-1);
        dp[0] = 1; dp[1] = 1;
        for(int i=0;i<M;++i)
        {
            dp[Integer.parseInt(br.readLine())] = 0;
        }
        for(int i=0;i<=N;++i)
        {
            if(dp[i]!=-1) continue;
            dp[i] = (dp[i-1]+dp[i-2])%MOD;
        }
        bw.write(dp[N]+"");
        bw.close();
    }

} Main
import java.io.*;
import java.util.Arrays;
import java.util.StringTokenizer;

public class Main
{
    static long[] dp;
    static int N,M;
    static final int MOD = 1000000007;
    public static void main(String[] args) throws IOException
    {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        StringTokenizer st = new StringTokenizer(br.readLine());
        N = Integer.parseInt(st.nextToken());
        M = Integer.parseInt(st.nextToken());
        dp = new long[N+1];
        Arrays.fill(dp,-1);
        dp[0] = 1; dp[1] = 1;
        for(int i=0;i<M;++i)
        {
            dp[Integer.parseInt(br.readLine())] = 0;
        }
        for(int i=0;i<=N;++i)
        {
            if(dp[i]!=-1) continue;
            dp[i] = (dp[i-1]+dp[i-2])%MOD;
        }
        bw.write(dp[N]+"");
        bw.close();
    }

}
