Problem: The king of Berland organizes a ball! n pair are invited to the ball, they are numbered from 1 to n. Each pair consists of one man and one woman. Each dancer (either man or woman) has a monochrome costume. The color of each costume is represented by an integer from 1 to k, inclusive.

Let b_i be the color of the man's costume and g_i be the color of the woman's costume in the i-th pair. You have to choose a color for each dancer's costume (i.e. values b_1, b_2, ..., b_n and g_1, g_2, ... g_n) in such a way that:

  1. for every i: b_i and g_i are integers between 1 and k, inclusive; 
  2. there are no two completely identical pairs, i.e. no two indices i, j (i ≠ j) such that b_i = b_j and g_i = g_j at the same time; 
  3. there is no pair such that the color of the man's costume is the same as the color of the woman's costume in this pair, i.e. b_i ≠ g_i for every i; 
  4. for each two consecutive (adjacent) pairs both man's costume colors and woman's costume colors differ, i.e. for every i from 1 to n-1 the conditions b_i ≠ b_{i + 1} and g_i ≠ g_{i + 1} hold. 



Let's take a look at the examples of bad and good color choosing (for n=4 and k=3, man is the first in a pair and woman is the second):

Bad color choosing: 

  * (1, 2), (2, 3), (3, 2), (1, 2) — contradiction with the second rule (there are equal pairs); 
  * (2, 3), (1, 1), (3, 2), (1, 3) — contradiction with the third rule (there is a pair with costumes of the same color); 
  * (1, 2), (2, 3), (1, 3), (2, 1) — contradiction with the fourth rule (there are two consecutive pairs such that colors of costumes of men/women are the same). 



Good color choosing: 

  * (1, 2), (2, 1), (1, 3), (3, 1); 
  * (1, 2), (3, 1), (2, 3), (3, 2); 
  * (3, 1), (1, 2), (2, 3), (3, 2). 



You have to find any suitable color choosing or say that no suitable choosing exists.

Input

The only line of the input contains two integers n and k (2 ≤ n, k ≤ 2 ⋅ 10^5) — the number of pairs and the number of colors.

Output

If it is impossible to find any suitable colors choosing, print "NO".

Otherwise print "YES" and then the colors of the costumes of pairs in the next n lines. The i-th line should contain two integers b_i and g_i — colors of costumes of man and woman in the i-th pair, respectively.

You can print each letter in any case (upper or lower). For example, "YeS", "no" and "yES" are all acceptable.

Examples

Input


4 3


Output


YES
3 1
1 3
3 2
2 3


Input


10 4


Output


YES
2 1
1 3
4 2
3 4
4 3
3 2
2 4
4 1
1 4
3 1


Input


13 4


Output


NO

Solution (in JAVA):

Solution:
import java.io.*;
import java.util.*;

public class Main {
	static long mod=1000000007;
	public static void main(String[] args){
		int n=ni(),k=ni();
		long kk=k;
		if((kk*kk-kk) < n) {
			pl("NO");
			flush();
			return;
		}
		pl("YES");
		for(int i=0;i<n;i++){
			int g=i%k;
			int b=(g+(i/k)+1)%k;
			g++;
			b++;
			pl(g+" "+b);
		}
		flush();
	}
    
    
    
    
    
	private static final byte[] buffer = new byte[1024];
	private static int ptr = 0;
	private static int buflen = 0;
	private static boolean hasNextByte() {
		if (ptr < buflen)  return true;
		else{
			ptr = 0;
			try {
				buflen = System.in.read(buffer);
			} catch (IOException e) {e.printStackTrace();}
			if (buflen <= 0)  return false;
		}
		return true;
	}
	private static int readByte() { return hasNextByte() ? buffer[ptr++] : -1;}
	private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
	private static void skipUnprintable() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;}
	public static boolean hasNext() { skipUnprintable(); return hasNextByte();}
	public static String next() {
		if (!hasNext()) throw new NoSuchElementException();
		StringBuilder sb = new StringBuilder();
		for(int b = readByte();isPrintableChar(b);b = readByte()) {
			sb.appendCodePoint(b);
		}
		return sb.toString();
	}
	public static int nextInt() {return (int)nextLong();}
	public static 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 = n * 10 + b-'0';
			else if(b == -1 || !isPrintableChar(b)) return minus ? -n : n;
			else throw new NumberFormatException();
			b = readByte();
		}
	}
	public static long[] nextLongArray(int i){
		long[] result=new long[i];
		for(int j=0;j<i;j++)  result[j]=nextLong();
		return result;
	}
	public static void nextLongArray(long[]... arrays){
		for(int j=0;j<arrays[0].length;j++)
			for(long[] array:arrays) array[j]=nextLong();
	}
	public static int[] nextIntArray(int i){
		int[] result=new int[i];
		for(int j=0;j<i;j++)  result[j]=nextInt();
		return result;
	}
	public static void nextIntArray(int[]... arrays){
		for(int j=0;j<arrays[0].length;j++)
			for(int[] array:arrays)  array[j]=nextInt();
	}
	public static int ni(){return nextInt();}
	public static long nl(){return nextLong();}
	public static int[] nia(int n){return nextIntArray(n);}
	public static long[] nla(int n){return nextLongArray(n);}
	public static String ne(){return next();}
	
	static StringBuilder sb=new StringBuilder();
	public static void flush(){
		System.out.print(sb);
		sb=new StringBuilder();
	}
	public static void pr(Object o){sb.append(o);}
	public static void pl(Object o){sb.append(o).append("\n");}
	public static void pl(){sb.append("\n");}
	public static int lastLowerIndex(long[] array,long lo){return lastLowerOrEqualIndex(array,lo-1);}
	public static int lastLowerOrEqualIndex(long[] array,long lo){
		int res=Arrays.binarySearch(array,lo);
		return res<0?-res-2:res;
	}
	public static long gcd(long a,long b){
		if(a>b)a%=b;
		while(a>0){
			b%=a;
			if(b==0)return a;
			a%=b;
		}
		return b;
	}
	public static long modPow(long a,long b,long mod){
		long c=1;
		while(b>0){
			if(b%2==1)  c=(c*a)%mod;
			a=(a*a)%mod;
			b/=2;
		}
		return c;
	}
	public static long inv(long a,long mod){
		long b=mod;
		long p = 1, q = 0;
		while (b > 0) {
			long c = a / b;
			long d=a;
			a = b;
			b = d % b;
			d = p;
			p = q;
			q = d - c * q;
		}
		return p < 0 ? p + mod : p;
	}
	static long time=0;
	public static void time(){
		if(time==0) time=System.nanoTime();
		else{
			long t=System.nanoTime();
			pl((t-time)/1000000000.0+"sec");
			time=t;
		}
	}
	public static Integer[] sortedIndex(long[] a){
            Integer[] res=new Integer[a.length];
            for(int i=0;i<a.length;i++)	res[i]=i;
            mergesortIndex(res,a,0,a.length);
            return res;
        }
        private static Integer[] stem=new Integer[200005];
        private static void mergesortIndex(Integer[] index,long[] a, int s, int e){//uwi's
            if(e - s <= 1)return;
            int h = s+e>>1;
            mergesortIndex(index,a, s, h);
            mergesortIndex(index,a, h, e);
            int p = 0;
            int i= s, j = h;
            for(;i < h && j < e;)stem[p++] = a[(int)index[i]] < a[(int)index[j]] ? index[i++] : index[j++];
            while(i < h)stem[p++] = index[i++];
            while(j < e)stem[p++] = index[j++];
            System.arraycopy(stem, 0, index, s, e-s);
        }
        private static long[] stmp=new long[200005];
        private static void mergesort(long[] a, int s, int e){//uwi's
            if(e - s <= 1)return;
            int h = s+e>>1;
            mergesort(a, s, h);
            mergesort(a, h, e);
            int p = 0;
            int i= s, j = h;
            for(;i < h && j < e;)stmp[p++] = a[i] < a[j] ? a[i++] : a[j++];
            while(i < h)stmp[p++] = a[i++];
            while(j < e)stmp[p++] = a[j++];
            System.arraycopy(stmp, 0, a, s, e-s);
        }
}