import java.io.*;
import java.util.*;

public class Main {

	final static long MOD = 1000000007L;
	public static String[] Ws = null;
	public static int wsIndx = 0;
	public static BufferedReader in = null;
	public static ArrayList<int[]> list = new ArrayList<>();
	public static void main(String[] args) throws Exception {

		int N =nextInt();
		int M =nextInt();

		int[] a = new int[M];

		int[] b = new int[M+1];

		int now = -1;
		for(int i=0;i<M;i++){
			a[i]=nextInt();
			b[i]=a[i]-now-1;
			if(i!=0&&a[i]-1==a[i-1]){
				System.out.println(0);
				return;
			}
			now=a[i];
		}
		b[b.length-1]=N-now;

		long ans = 1;
		long[] dp = new long[N+2];
		Arrays.fill(dp, 0);
		dp[0]=1;
		dp[1]=1;
		for(int i=0;i<b.length;i++){

			for(int k=2;k<b[i];k++){
				dp[k]=dp[k-2]+dp[k-1];
				dp[k]%=MOD;
			}
			ans=ans*dp[b[i]-1]%MOD;
		}
		System.out.println(ans);
	}


	public static String[] toStringArray(String s) {
		String[] tmp = new String[s.length()];
		char[] c = s.toCharArray();
		for (int i = 0; i < tmp.length; i++) {
			tmp[i] = String.valueOf(c[i]);
		}
		return tmp;
	}

	public static String concatStringArray(String[] s){
		StringBuffer sb = new StringBuffer();
		for(String x:s){
			sb.append(x);
		}
		return sb.toString();
	}

	public static void check() throws Exception{
		if(in == null){
			in = new BufferedReader(new InputStreamReader(System.in));
		}
		if(Ws==null || Ws.length<=wsIndx){
			Ws = in.readLine().split(" ");
			wsIndx=0;
		}
	}
	public static int nextInt()throws Exception{
		check();
		return Integer.parseInt(Ws[wsIndx++]);
	}

	public static long nextLong()throws Exception{
		check();
		return Long.parseLong(Ws[wsIndx++]);
	}

	public static String nextString()throws Exception{
		check();
		return Ws[wsIndx++];
	}

	public static int[] nextInts()throws Exception{
		check();
		int[] tmp = new int[Ws.length];
		for(int i=0;i<tmp.length;i++){
			tmp[i]=Integer.parseInt(Ws[i]);
		}
		wsIndx=Ws.length;
		return tmp;
	}

	public static long[] nextLongs()throws Exception{
		check();
		long[] tmp = new long[Ws.length];
		for(int i=0;i<tmp.length;i++){
			tmp[i]=Long.parseLong(Ws[i]);
		}
		wsIndx=Ws.length;
		return tmp;
	}

	public static String[] nextStrings()throws Exception{
		check();
		wsIndx=Ws.length;
		return Ws;
	}


} import java.io.*; io.* java import java.util.*; util.* java public class Main {

	final static long MOD = 1000000007L;
	public static String[] Ws = null;
	public static int wsIndx = 0;
	public static BufferedReader in = null;
	public static ArrayList<int[]> list = new ArrayList<>();
	public static void main(String[] args) throws Exception {

		int N =nextInt();
		int M =nextInt();

		int[] a = new int[M];

		int[] b = new int[M+1];

		int now = -1;
		for(int i=0;i<M;i++){
			a[i]=nextInt();
			b[i]=a[i]-now-1;
			if(i!=0&&a[i]-1==a[i-1]){
				System.out.println(0);
				return;
			}
			now=a[i];
		}
		b[b.length-1]=N-now;

		long ans = 1;
		long[] dp = new long[N+2];
		Arrays.fill(dp, 0);
		dp[0]=1;
		dp[1]=1;
		for(int i=0;i<b.length;i++){

			for(int k=2;k<b[i];k++){
				dp[k]=dp[k-2]+dp[k-1];
				dp[k]%=MOD;
			}
			ans=ans*dp[b[i]-1]%MOD;
		}
		System.out.println(ans);
	}


	public static String[] toStringArray(String s) {
		String[] tmp = new String[s.length()];
		char[] c = s.toCharArray();
		for (int i = 0; i < tmp.length; i++) {
			tmp[i] = String.valueOf(c[i]);
		}
		return tmp;
	}

	public static String concatStringArray(String[] s){
		StringBuffer sb = new StringBuffer();
		for(String x:s){
			sb.append(x);
		}
		return sb.toString();
	}

	public static void check() throws Exception{
		if(in == null){
			in = new BufferedReader(new InputStreamReader(System.in));
		}
		if(Ws==null || Ws.length<=wsIndx){
			Ws = in.readLine().split(" ");
			wsIndx=0;
		}
	}
	public static int nextInt()throws Exception{
		check();
		return Integer.parseInt(Ws[wsIndx++]);
	}

	public static long nextLong()throws Exception{
		check();
		return Long.parseLong(Ws[wsIndx++]);
	}

	public static String nextString()throws Exception{
		check();
		return Ws[wsIndx++];
	}

	public static int[] nextInts()throws Exception{
		check();
		int[] tmp = new int[Ws.length];
		for(int i=0;i<tmp.length;i++){
			tmp[i]=Integer.parseInt(Ws[i]);
		}
		wsIndx=Ws.length;
		return tmp;
	}

	public static long[] nextLongs()throws Exception{
		check();
		long[] tmp = new long[Ws.length];
		for(int i=0;i<tmp.length;i++){
			tmp[i]=Long.parseLong(Ws[i]);
		}
		wsIndx=Ws.length;
		return tmp;
	}

	public static String[] nextStrings()throws Exception{
		check();
		wsIndx=Ws.length;
		return Ws;
	}


} Main final static long MOD = 1000000007L; MOD 1000000007L public static String[] Ws = null; Ws null public static int wsIndx = 0; wsIndx 0 public static BufferedReader in = null; in null public static ArrayList<int[]> list = new ArrayList<>(); list new ArrayList<>() public static void main(String[] args) throws Exception {

		int N =nextInt();
		int M =nextInt();

		int[] a = new int[M];

		int[] b = new int[M+1];

		int now = -1;
		for(int i=0;i<M;i++){
			a[i]=nextInt();
			b[i]=a[i]-now-1;
			if(i!=0&&a[i]-1==a[i-1]){
				System.out.println(0);
				return;
			}
			now=a[i];
		}
		b[b.length-1]=N-now;

		long ans = 1;
		long[] dp = new long[N+2];
		Arrays.fill(dp, 0);
		dp[0]=1;
		dp[1]=1;
		for(int i=0;i<b.length;i++){

			for(int k=2;k<b[i];k++){
				dp[k]=dp[k-2]+dp[k-1];
				dp[k]%=MOD;
			}
			ans=ans*dp[b[i]-1]%MOD;
		}
		System.out.println(ans);
	} main {

		int N =nextInt();
		int M =nextInt();

		int[] a = new int[M];

		int[] b = new int[M+1];

		int now = -1;
		for(int i=0;i<M;i++){
			a[i]=nextInt();
			b[i]=a[i]-now-1;
			if(i!=0&&a[i]-1==a[i-1]){
				System.out.println(0);
				return;
			}
			now=a[i];
		}
		b[b.length-1]=N-now;

		long ans = 1;
		long[] dp = new long[N+2];
		Arrays.fill(dp, 0);
		dp[0]=1;
		dp[1]=1;
		for(int i=0;i<b.length;i++){

			for(int k=2;k<b[i];k++){
				dp[k]=dp[k-2]+dp[k-1];
				dp[k]%=MOD;
			}
			ans=ans*dp[b[i]-1]%MOD;
		}
		System.out.println(ans);
	} int N =nextInt(); N nextInt() nextInt int M =nextInt(); M nextInt() nextInt int[] a = new int[M]; a new int[M] M int[] b = new int[M+1]; b new int[M+1] M+1 M 1 int now = -1; now -1 1 for(int i=0;i<M;i++){
			a[i]=nextInt();
			b[i]=a[i]-now-1;
			if(i!=0&&a[i]-1==a[i-1]){
				System.out.println(0);
				return;
			}
			now=a[i];
		} int i=0; int i=0; i 0 i<M i M i++ i++ i {
			a[i]=nextInt();
			b[i]=a[i]-now-1;
			if(i!=0&&a[i]-1==a[i-1]){
				System.out.println(0);
				return;
			}
			now=a[i];
		} {
			a[i]=nextInt();
			b[i]=a[i]-now-1;
			if(i!=0&&a[i]-1==a[i-1]){
				System.out.println(0);
				return;
			}
			now=a[i];
		} a[i]=nextInt() a[i] a i nextInt() nextInt b[i]=a[i]-now-1 b[i] b i a[i]-now-1 a[i]-now-1 a[i] a i now 1 if(i!=0&&a[i]-1==a[i-1]){
				System.out.println(0);
				return;
			} i!=0&&a[i]-1==a[i-1] i!=0 i 0 a[i]-1==a[i-1] a[i]-1 a[i] a i 1 a[i-1] a i-1 i 1 {
				System.out.println(0);
				return;
			} System.out.println(0) System.out.println System.out System System.out 0 return; now=a[i] now a[i] a i b[b.length-1]=N-now b[b.length-1] b b.length-1 b.length b b.length 1 N-now N now long ans = 1; ans 1 long[] dp = new long[N+2]; dp new long[N+2] N+2 N 2 Arrays.fill(dp, 0) Arrays.fill Arrays dp 0 dp[0]=1 dp[0] dp 0 1 dp[1]=1 dp[1] dp 1 1 for(int i=0;i<b.length;i++){

			for(int k=2;k<b[i];k++){
				dp[k]=dp[k-2]+dp[k-1];
				dp[k]%=MOD;
			}
			ans=ans*dp[b[i]-1]%MOD;
		} int i=0; int i=0; i 0 i<b.length i b.length b b.length i++ i++ i {

			for(int k=2;k<b[i];k++){
				dp[k]=dp[k-2]+dp[k-1];
				dp[k]%=MOD;
			}
			ans=ans*dp[b[i]-1]%MOD;
		} {

			for(int k=2;k<b[i];k++){
				dp[k]=dp[k-2]+dp[k-1];
				dp[k]%=MOD;
			}
			ans=ans*dp[b[i]-1]%MOD;
		} for(int k=2;k<b[i];k++){
				dp[k]=dp[k-2]+dp[k-1];
				dp[k]%=MOD;
			} int k=2; int k=2; k 2 k<b[i] k b[i] b i k++ k++ k {
				dp[k]=dp[k-2]+dp[k-1];
				dp[k]%=MOD;
			} {
				dp[k]=dp[k-2]+dp[k-1];
				dp[k]%=MOD;
			} dp[k]=dp[k-2]+dp[k-1] dp[k] dp k dp[k-2]+dp[k-1] dp[k-2] dp k-2 k 2 dp[k-1] dp k-1 k 1 dp[k]%=MOD dp[k] dp k MOD ans=ans*dp[b[i]-1]%MOD ans ans*dp[b[i]-1]%MOD ans*dp[b[i]-1] ans dp[b[i]-1] dp b[i]-1 b[i] b i 1 MOD System.out.println(ans) System.out.println System.out System System.out ans String[] args args public static String[] toStringArray(String s) {
		String[] tmp = new String[s.length()];
		char[] c = s.toCharArray();
		for (int i = 0; i < tmp.length; i++) {
			tmp[i] = String.valueOf(c[i]);
		}
		return tmp;
	} toStringArray {
		String[] tmp = new String[s.length()];
		char[] c = s.toCharArray();
		for (int i = 0; i < tmp.length; i++) {
			tmp[i] = String.valueOf(c[i]);
		}
		return tmp;
	} String[] tmp = new String[s.length()]; tmp new String[s.length()] s.length() s.length s char[] c = s.toCharArray(); c s.toCharArray() s.toCharArray s for (int i = 0; i < tmp.length; i++) {
			tmp[i] = String.valueOf(c[i]);
		} int i = 0; int i = 0; i 0 i < tmp.length i tmp.length tmp tmp.length i++ i++ i {
			tmp[i] = String.valueOf(c[i]);
		} {
			tmp[i] = String.valueOf(c[i]);
		} tmp[i] = String.valueOf(c[i]) tmp[i] tmp i String.valueOf(c[i]) String.valueOf String c[i] c i return tmp; tmp String s s public static String concatStringArray(String[] s){
		StringBuffer sb = new StringBuffer();
		for(String x:s){
			sb.append(x);
		}
		return sb.toString();
	} concatStringArray {
		StringBuffer sb = new StringBuffer();
		for(String x:s){
			sb.append(x);
		}
		return sb.toString();
	} StringBuffer sb = new StringBuffer(); sb new StringBuffer() for(String x:s){
			sb.append(x);
		} String x s {
			sb.append(x);
		} {
			sb.append(x);
		} sb.append(x) sb.append sb x return sb.toString(); sb.toString() sb.toString sb String[] s s public static void check() throws Exception{
		if(in == null){
			in = new BufferedReader(new InputStreamReader(System.in));
		}
		if(Ws==null || Ws.length<=wsIndx){
			Ws = in.readLine().split(" ");
			wsIndx=0;
		}
	} check {
		if(in == null){
			in = new BufferedReader(new InputStreamReader(System.in));
		}
		if(Ws==null || Ws.length<=wsIndx){
			Ws = in.readLine().split(" ");
			wsIndx=0;
		}
	} if(in == null){
			in = new BufferedReader(new InputStreamReader(System.in));
		} in == null in null {
			in = new BufferedReader(new InputStreamReader(System.in));
		} in = new BufferedReader(new InputStreamReader(System.in)) in new BufferedReader(new InputStreamReader(System.in)) if(Ws==null || Ws.length<=wsIndx){
			Ws = in.readLine().split(" ");
			wsIndx=0;
		} Ws==null || Ws.length<=wsIndx Ws==null Ws null Ws.length<=wsIndx Ws.length Ws Ws.length wsIndx {
			Ws = in.readLine().split(" ");
			wsIndx=0;
		} Ws = in.readLine().split(" ") Ws in.readLine().split(" ") in.readLine().split in.readLine() in.readLine in " " wsIndx=0 wsIndx 0 public static int nextInt()throws Exception{
		check();
		return Integer.parseInt(Ws[wsIndx++]);
	} nextInt {
		check();
		return Integer.parseInt(Ws[wsIndx++]);
	} check() check return Integer.parseInt(Ws[wsIndx++]); Integer.parseInt(Ws[wsIndx++]) Integer.parseInt Integer Ws[wsIndx++] Ws wsIndx++ wsIndx public static long nextLong()throws Exception{
		check();
		return Long.parseLong(Ws[wsIndx++]);
	} nextLong {
		check();
		return Long.parseLong(Ws[wsIndx++]);
	} check() check return Long.parseLong(Ws[wsIndx++]); Long.parseLong(Ws[wsIndx++]) Long.parseLong Long Ws[wsIndx++] Ws wsIndx++ wsIndx public static String nextString()throws Exception{
		check();
		return Ws[wsIndx++];
	} nextString {
		check();
		return Ws[wsIndx++];
	} check() check return Ws[wsIndx++]; Ws[wsIndx++] Ws wsIndx++ wsIndx public static int[] nextInts()throws Exception{
		check();
		int[] tmp = new int[Ws.length];
		for(int i=0;i<tmp.length;i++){
			tmp[i]=Integer.parseInt(Ws[i]);
		}
		wsIndx=Ws.length;
		return tmp;
	} nextInts {
		check();
		int[] tmp = new int[Ws.length];
		for(int i=0;i<tmp.length;i++){
			tmp[i]=Integer.parseInt(Ws[i]);
		}
		wsIndx=Ws.length;
		return tmp;
	} check() check int[] tmp = new int[Ws.length]; tmp new int[Ws.length] Ws.length Ws Ws.length for(int i=0;i<tmp.length;i++){
			tmp[i]=Integer.parseInt(Ws[i]);
		} int i=0; int i=0; i 0 i<tmp.length i tmp.length tmp tmp.length i++ i++ i {
			tmp[i]=Integer.parseInt(Ws[i]);
		} {
			tmp[i]=Integer.parseInt(Ws[i]);
		} tmp[i]=Integer.parseInt(Ws[i]) tmp[i] tmp i Integer.parseInt(Ws[i]) Integer.parseInt Integer Ws[i] Ws i wsIndx=Ws.length wsIndx Ws.length Ws Ws.length return tmp; tmp public static long[] nextLongs()throws Exception{
		check();
		long[] tmp = new long[Ws.length];
		for(int i=0;i<tmp.length;i++){
			tmp[i]=Long.parseLong(Ws[i]);
		}
		wsIndx=Ws.length;
		return tmp;
	} nextLongs {
		check();
		long[] tmp = new long[Ws.length];
		for(int i=0;i<tmp.length;i++){
			tmp[i]=Long.parseLong(Ws[i]);
		}
		wsIndx=Ws.length;
		return tmp;
	} check() check long[] tmp = new long[Ws.length]; tmp new long[Ws.length] Ws.length Ws Ws.length for(int i=0;i<tmp.length;i++){
			tmp[i]=Long.parseLong(Ws[i]);
		} int i=0; int i=0; i 0 i<tmp.length i tmp.length tmp tmp.length i++ i++ i {
			tmp[i]=Long.parseLong(Ws[i]);
		} {
			tmp[i]=Long.parseLong(Ws[i]);
		} tmp[i]=Long.parseLong(Ws[i]) tmp[i] tmp i Long.parseLong(Ws[i]) Long.parseLong Long Ws[i] Ws i wsIndx=Ws.length wsIndx Ws.length Ws Ws.length return tmp; tmp public static String[] nextStrings()throws Exception{
		check();
		wsIndx=Ws.length;
		return Ws;
	} nextStrings {
		check();
		wsIndx=Ws.length;
		return Ws;
	} check() check wsIndx=Ws.length wsIndx Ws.length Ws Ws.length return Ws; Ws public class Main {

	final static long MOD = 1000000007L;
	public static String[] Ws = null;
	public static int wsIndx = 0;
	public static BufferedReader in = null;
	public static ArrayList<int[]> list = new ArrayList<>();
	public static void main(String[] args) throws Exception {

		int N =nextInt();
		int M =nextInt();

		int[] a = new int[M];

		int[] b = new int[M+1];

		int now = -1;
		for(int i=0;i<M;i++){
			a[i]=nextInt();
			b[i]=a[i]-now-1;
			if(i!=0&&a[i]-1==a[i-1]){
				System.out.println(0);
				return;
			}
			now=a[i];
		}
		b[b.length-1]=N-now;

		long ans = 1;
		long[] dp = new long[N+2];
		Arrays.fill(dp, 0);
		dp[0]=1;
		dp[1]=1;
		for(int i=0;i<b.length;i++){

			for(int k=2;k<b[i];k++){
				dp[k]=dp[k-2]+dp[k-1];
				dp[k]%=MOD;
			}
			ans=ans*dp[b[i]-1]%MOD;
		}
		System.out.println(ans);
	}


	public static String[] toStringArray(String s) {
		String[] tmp = new String[s.length()];
		char[] c = s.toCharArray();
		for (int i = 0; i < tmp.length; i++) {
			tmp[i] = String.valueOf(c[i]);
		}
		return tmp;
	}

	public static String concatStringArray(String[] s){
		StringBuffer sb = new StringBuffer();
		for(String x:s){
			sb.append(x);
		}
		return sb.toString();
	}

	public static void check() throws Exception{
		if(in == null){
			in = new BufferedReader(new InputStreamReader(System.in));
		}
		if(Ws==null || Ws.length<=wsIndx){
			Ws = in.readLine().split(" ");
			wsIndx=0;
		}
	}
	public static int nextInt()throws Exception{
		check();
		return Integer.parseInt(Ws[wsIndx++]);
	}

	public static long nextLong()throws Exception{
		check();
		return Long.parseLong(Ws[wsIndx++]);
	}

	public static String nextString()throws Exception{
		check();
		return Ws[wsIndx++];
	}

	public static int[] nextInts()throws Exception{
		check();
		int[] tmp = new int[Ws.length];
		for(int i=0;i<tmp.length;i++){
			tmp[i]=Integer.parseInt(Ws[i]);
		}
		wsIndx=Ws.length;
		return tmp;
	}

	public static long[] nextLongs()throws Exception{
		check();
		long[] tmp = new long[Ws.length];
		for(int i=0;i<tmp.length;i++){
			tmp[i]=Long.parseLong(Ws[i]);
		}
		wsIndx=Ws.length;
		return tmp;
	}

	public static String[] nextStrings()throws Exception{
		check();
		wsIndx=Ws.length;
		return Ws;
	}


} public class Main {

	final static long MOD = 1000000007L;
	public static String[] Ws = null;
	public static int wsIndx = 0;
	public static BufferedReader in = null;
	public static ArrayList<int[]> list = new ArrayList<>();
	public static void main(String[] args) throws Exception {

		int N =nextInt();
		int M =nextInt();

		int[] a = new int[M];

		int[] b = new int[M+1];

		int now = -1;
		for(int i=0;i<M;i++){
			a[i]=nextInt();
			b[i]=a[i]-now-1;
			if(i!=0&&a[i]-1==a[i-1]){
				System.out.println(0);
				return;
			}
			now=a[i];
		}
		b[b.length-1]=N-now;

		long ans = 1;
		long[] dp = new long[N+2];
		Arrays.fill(dp, 0);
		dp[0]=1;
		dp[1]=1;
		for(int i=0;i<b.length;i++){

			for(int k=2;k<b[i];k++){
				dp[k]=dp[k-2]+dp[k-1];
				dp[k]%=MOD;
			}
			ans=ans*dp[b[i]-1]%MOD;
		}
		System.out.println(ans);
	}


	public static String[] toStringArray(String s) {
		String[] tmp = new String[s.length()];
		char[] c = s.toCharArray();
		for (int i = 0; i < tmp.length; i++) {
			tmp[i] = String.valueOf(c[i]);
		}
		return tmp;
	}

	public static String concatStringArray(String[] s){
		StringBuffer sb = new StringBuffer();
		for(String x:s){
			sb.append(x);
		}
		return sb.toString();
	}

	public static void check() throws Exception{
		if(in == null){
			in = new BufferedReader(new InputStreamReader(System.in));
		}
		if(Ws==null || Ws.length<=wsIndx){
			Ws = in.readLine().split(" ");
			wsIndx=0;
		}
	}
	public static int nextInt()throws Exception{
		check();
		return Integer.parseInt(Ws[wsIndx++]);
	}

	public static long nextLong()throws Exception{
		check();
		return Long.parseLong(Ws[wsIndx++]);
	}

	public static String nextString()throws Exception{
		check();
		return Ws[wsIndx++];
	}

	public static int[] nextInts()throws Exception{
		check();
		int[] tmp = new int[Ws.length];
		for(int i=0;i<tmp.length;i++){
			tmp[i]=Integer.parseInt(Ws[i]);
		}
		wsIndx=Ws.length;
		return tmp;
	}

	public static long[] nextLongs()throws Exception{
		check();
		long[] tmp = new long[Ws.length];
		for(int i=0;i<tmp.length;i++){
			tmp[i]=Long.parseLong(Ws[i]);
		}
		wsIndx=Ws.length;
		return tmp;
	}

	public static String[] nextStrings()throws Exception{
		check();
		wsIndx=Ws.length;
		return Ws;
	}


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

public class Main {

	final static long MOD = 1000000007L;
	public static String[] Ws = null;
	public static int wsIndx = 0;
	public static BufferedReader in = null;
	public static ArrayList<int[]> list = new ArrayList<>();
	public static void main(String[] args) throws Exception {

		int N =nextInt();
		int M =nextInt();

		int[] a = new int[M];

		int[] b = new int[M+1];

		int now = -1;
		for(int i=0;i<M;i++){
			a[i]=nextInt();
			b[i]=a[i]-now-1;
			if(i!=0&&a[i]-1==a[i-1]){
				System.out.println(0);
				return;
			}
			now=a[i];
		}
		b[b.length-1]=N-now;

		long ans = 1;
		long[] dp = new long[N+2];
		Arrays.fill(dp, 0);
		dp[0]=1;
		dp[1]=1;
		for(int i=0;i<b.length;i++){

			for(int k=2;k<b[i];k++){
				dp[k]=dp[k-2]+dp[k-1];
				dp[k]%=MOD;
			}
			ans=ans*dp[b[i]-1]%MOD;
		}
		System.out.println(ans);
	}


	public static String[] toStringArray(String s) {
		String[] tmp = new String[s.length()];
		char[] c = s.toCharArray();
		for (int i = 0; i < tmp.length; i++) {
			tmp[i] = String.valueOf(c[i]);
		}
		return tmp;
	}

	public static String concatStringArray(String[] s){
		StringBuffer sb = new StringBuffer();
		for(String x:s){
			sb.append(x);
		}
		return sb.toString();
	}

	public static void check() throws Exception{
		if(in == null){
			in = new BufferedReader(new InputStreamReader(System.in));
		}
		if(Ws==null || Ws.length<=wsIndx){
			Ws = in.readLine().split(" ");
			wsIndx=0;
		}
	}
	public static int nextInt()throws Exception{
		check();
		return Integer.parseInt(Ws[wsIndx++]);
	}

	public static long nextLong()throws Exception{
		check();
		return Long.parseLong(Ws[wsIndx++]);
	}

	public static String nextString()throws Exception{
		check();
		return Ws[wsIndx++];
	}

	public static int[] nextInts()throws Exception{
		check();
		int[] tmp = new int[Ws.length];
		for(int i=0;i<tmp.length;i++){
			tmp[i]=Integer.parseInt(Ws[i]);
		}
		wsIndx=Ws.length;
		return tmp;
	}

	public static long[] nextLongs()throws Exception{
		check();
		long[] tmp = new long[Ws.length];
		for(int i=0;i<tmp.length;i++){
			tmp[i]=Long.parseLong(Ws[i]);
		}
		wsIndx=Ws.length;
		return tmp;
	}

	public static String[] nextStrings()throws Exception{
		check();
		wsIndx=Ws.length;
		return Ws;
	}


}