import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.NoSuchElementException;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		new Main().run();
	}

	static void run() {
		FastScanner sc = new FastScanner();
		int n = sc.nextInt();
		int m = sc.nextInt();
		int[] x = new int[m];
		for (int i = 0; i < m; ++i)
			x[i] = sc.nextInt();
		dp = new int[(n + 1) / 2];
		long mo1 = 17 * 9920467;
		long mo2 = 592951213;
		long mo3 = mo1 * mo2;
		long ans1 = solve(mo1, n, m, x);
		long ans2 = solve(mo2, n, m, x);
		long f1 = ans1 % mo1 * inv(mo2, mo1) % mo1 * mo2 % mo3;
		long f2 = inv(mo1, mo2) % mo2 * (ans2 % mo2 - f1 % mo2 + mo2) % mo2 * mo1 % mo3;
		System.out.println((f1 + f2) % mo3);
	}

	static  long inv(long a, long mo) {
		a %= mo;
		long u=0,v=1,s=mo,t=a;
		while (t!=0) {
			long q=s/t;
			u-=v*q;
			s-=t*q;
			s^=t;t^=s;s^=t;
			u^=v;v^=u;u^=v;
		}
		if (u<0) u+=mo;
		return u;
	}

	static int[] dp;

	static long solve(long mo, int n, int m, int[] x) {
		Arrays.fill(dp, 0);
		dp[0] = 1;
		for (int i = 0; i < dp.length; ++i) {
			for (int j = 0; j < x.length; ++j) {
				if (i + x[j] >= dp.length)
					continue;
				dp[i + x[j]] = (int) ((dp[i + x[j]] + dp[i]) % mo);
			}
		}
		long ret = 0;
		for (int i = 0; i < dp.length; ++i) {
			for (int j = 0; j < m; ++j) {
				if (x[j] + i < dp.length || (n - 1) - x[j] - i < 0)
					continue;
				ret = (ret + (long) dp[(n - 1) - x[j] - i] * dp[i] % mo) % mo;
			}
		}
		return ret;
	}

	void tr(Object... objects) {
		System.out.println(Arrays.deepToString(objects));
	}
}


class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        }else{
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }
    private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
    private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
    public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; return hasNextByte();}
    public String next() {
        if (!hasNext()) throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while(isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    public long nextLong() {
        if (!hasNext()) throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while(true){
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            }else if(b == -1 || !isPrintableChar(b)){
                return minus ? -n : n;
            }else{
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();
        return (int) nl;
    }
    public double nextDouble() { return Double.parseDouble(next());}
}