Problem: There is an infinite board of square tiles. Initially all tiles are white.

Vova has a red marker and a blue marker. Red marker can color a tiles. Blue marker can color b tiles. If some tile isn't white then you can't use marker of any color on it. Each marker must be drained completely, so at the end there should be exactly a red tiles and exactly b blue tiles across the board.

Vova wants to color such a set of tiles that:

  * they would form a rectangle, consisting of exactly a+b colored tiles; 
  * all tiles of at least one color would also form a rectangle. 



Here are some examples of correct colorings:

<image>

Here are some examples of incorrect colorings:

<image>

Among all correct colorings Vova wants to choose the one with the minimal perimeter. What is the minimal perimeter Vova can obtain?

It is guaranteed that there exists at least one correct coloring.

Input

A single line contains two integers a and b (1 ≤ a, b ≤ 10^{14}) — the number of tiles red marker should color and the number of tiles blue marker should color, respectively.

Output

Print a single integer — the minimal perimeter of a colored rectangle Vova can obtain by coloring exactly a tiles red and exactly b tiles blue.

It is guaranteed that there exists at least one correct coloring.

Examples

Input

4 4


Output

12


Input

3 9


Output

14


Input

9 3


Output

14


Input

3 6


Output

12


Input

506 2708


Output

3218

Note

The first four examples correspond to the first picture of the statement.

Note that for there exist multiple correct colorings for all of the examples.

In the first example you can also make a rectangle with sides 1 and 8, though its perimeter will be 18 which is greater than 8.

In the second example you can make the same resulting rectangle with sides 3 and 4, but red tiles will form the rectangle with sides 1 and 3 and blue tiles will form the rectangle with sides 3 and 3.

Solution (in JAVA):

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


public final class A
{    
	static PrintWriter out = new PrintWriter(System.out); 
	static StringBuilder ans=new StringBuilder();
	static FastReader in=new FastReader();
	static ArrayList<Integer> g[];
	static long mod=(long)10e9+7,INF=Long.MAX_VALUE;
	static boolean set[],col[]; 
	static int par[],tot[],partial[];
	static int D[],P[][];
	static long dp[][],sum=0,max=0,size[];
	//	static node1 seg[];
	//static pair moves[]= {new pair(-1,0),new pair(1,0), new pair(0,-1), new pair(0,1)};
	public static void main(String args[])throws IOException
	{				
		long a=l(),b=l();
		long s=a+b;
		max=(s+1L)*2L;
		ArrayList<Long> A=f(s),B=f(a),C=f(b);
		f(A,B,s,a);f(A,C,s,b);
		out.println(max);
		out.close();

	}
	static void f(ArrayList<Long> A,ArrayList<Long> B,long s,long a)
	{
		for(long x:A)
		{
			long y=s/x;
			int i=f(x,B);
			if(i==-1)continue;
			long x1=B.get(i);
			long y1=a/x1;
			if(x1<=x && y1<=y)
			{
				max=Math.min(max, 2L*(x+y));
			}
		}
	}
	static int f(long a,ArrayList<Long> A)
	{
		int l=-1,r=A.size();
		while(r-l>1)
		{
			int m=(l+r)/2;
			long x=A.get(m);
			if(x<=a)l=m;
			else r=m;
		}
		return l;
	}
	static ArrayList<Long> f(long a)
	{
		ArrayList<Long> A=new ArrayList<>();
		for(long i=1; i*i<=a; i++)
		{
			if(a%i==0)A.add(i);
		}
		return A;
	}
	static int f(long a,long A[])
	{
		int l=-1,r=A.length;
		while(r-l>1)
		{
			int m=(l+r)/2;
			if(A[m]<=a)l=m;
			else r=m;
		}
		return l;
	}
	static boolean f1(int l,char X[])
	{
		int i=0;
		for(; l<X.length; l++)
		{
			if(X[i]!=X[l])return false;
			i++;
		}
		return true;
	}
	static int f(int a)
	{
		for(int i=a+1; a>0; a++)
		{
			if(GCD(i,a)==1)return i;
		}
		return 0;
	}
	static int min(char X[],char str[],int N)
	{
		int s=0;
		for(int i=0; i<N; i++)
		{
			int it=i%3;
			if(X[i]!=str[it])s++;
			//             ans.append(str[it]);
		}
		return s;
	}
	static char f(int i,char X[])
	{
		int a=0,b=0,c=0;
		for(; i<X.length; i+=3)
		{
			if(X[i]=='R')a++;
			if(X[i]=='B')b++;
			if(X[i]=='G')c++;
		}
		if(a>=b && a>=c)return 'R';
		if(b>=a && b>=c)return 'B';
		return 'G';
	}

	static void dfs(int n,int p)
	{
		size[n]=1;
		for(int c:g[n])
		{
			if(c==p)continue;
			dfs(c,n);
			size[n]+=size[c];
		}
		sum+=size[n];
		max=sum;
	}
	static void f1(int n,int p,long sum,int N)
	{
		for(int c:g[n])
		{
			if(c==p)continue;

			long s=sum+N-2*size[c];
			f1(c,n,s,N);
			max=Math.max(max, s);
		}
	}
	static long f(int i,int j,ArrayList<Integer> A)
	{

		if(i+1==A.size())
		{
			return j;
		}		
		int moves=1+A.get(i);
		if(j==1)return 1+f(i+1,moves,A);
		if(j>0 && dp[i][j-1]==0)f(i,j-1,A);
		return dp[i][j]=dp[i][j-1]+f(i+1,j+moves,A);
	}
	//	static void build(int v,int tl,int tr,long A[])
	//	{
	//		if(tl==tr)
	//		{
	//			seg[v]=new node1(A[tl],A[tr],1,true);
	//			return ;
	//		}
	//		int tm=(tl+tr)/2;
	//		build(2*v,tl,tm,A);
	//		build(2*v+1,tm+1,tr,A);
	//		seg[v]=merge(seg[2*v],seg[2*v+1]);
	//	}
	//	static node1 ask(int v,int tl,int tr,int l,int r)
	//	{
	//		if(l>r)return new node1(0,0,0,false);//verify true or false
	//		if(tl==l && tr==r)return seg[v];
	//		int tm=(tl+tr)/2;
	//		node1 a=ask(v*2,tl,tm,l,Math.min(tm, r));
	//		node1 b=ask(v*2+1,tm+1,tr,Math.max(tm+1, l),r);
	//		return merge(a,b);
	//	}
	//	static node1 merge(node1 a,node1 b)
	//	{
	//		long s=0;
	//		long l1=a.L,r1=a.R,c1=a.cnt;
	//		long l2=b.L,r2=b.R,c2=b.cnt;
	//		long g=GCD(l2,r1); s=c1+c2;
	//		if(g==1)
	//		{
	//			s--;
	//			g=(l2*r1)/g;
	//			if(c1==1)
	//			{
	//				l1=g;
	//			}
	//			if(c2==1)r2=g;
	//			return new node1(l1,r2,s,true);
	//		}
	//		return new node1(l1,r2,s,a.leaf^b.leaf);
	//	}
	static long f(long l,long r,long a,long b,long N)
	{
		while(r-l>1)
		{
			long m=(l+r)/2;
			long x=m*b;
			if(N<x)
			{
				r=m;
				continue;
			}
			if((N-x)%a==0)r=m;
			else l=m;

		}
		return r;
	}
	static long f1(long a,long A[],long bits[],long sum)
	{
		long s=A.length;
		s=mul(s,a);
		s=(s+(sum%mod))%mod;
		long p=1L;
		for(long x:bits)
		{
			if((a&p)!=0)s=((s-mul(x,p))+mod)%mod;
			p<<=1;
		}
		return s;
	}
	static long f2(long a,long A[],long bits[])
	{
		long s=0;
		long p=1L;
		for(long x:bits)
		{
			if((a&p)!=0)
			{
				s=(s+mul(p,x))%mod;
			}
			p<<=1;
		}
		return s;
	}
	static long f(long x1,long y1,long x2,long y2)
	{
		return Math.abs(x1-x2)+Math.abs(y1-y2);
	}
	static long f(long x,long max,long s)
	{
		long l=-1,r=(x/s)+1;
		while(r-l>1)
		{
			long m=(l+r)/2;
			if(x-m*s>max)l=m;
			else r=m;
		}
		return l+1;
	}
	static int f(long A[],long x)
	{
		int l=-1,r=A.length;
		while(r-l>1)
		{
			int m=(l+r)/2;
			if(A[m]>=x)r=m;
			else l=m;			
		}
		return r;
	}



	static int bin(int x,ArrayList<Integer> A)
	{
		int l=0,r=A.size()-1;
		while(l<=r)
		{
			int m=(l+r)/2;
			int a=A.get(m);
			if(a==x)return m;
			if(a<x)l=m+1;
			else r=m-1;
		}
		return 0;
	}
	static int left(int x,ArrayList<Integer> A)
	{
		int l=-1,r=A.size();
		while(r-l>1)
		{
			int m=(l+r)/2;
			int a=A.get(m);
			if(a<=x)l=m;
			else r=m;
		}
		return l;
	}
	static int right(int x,ArrayList<Integer> A)
	{
		int l=-1,r=A.size();
		while(r-l>1)
		{
			int m=(l+r)/2;
			int a=A.get(m);
			if(a<x)l=m;
			else r=m;
		}
		return r;
	}



	static boolean equal(long A[],long B[])
	{
		for(int i=0; i<A.length; i++)if(A[i]!=B[i])return false;
		return true;	
	}


	static int max(int a ,int b,int c,int d)
	{
		a=Math.max(a, b);
		c=Math.max(c,d);
		return Math.max(a, c);
	}
	static int min(int a ,int b,int c,int d)
	{
		a=Math.min(a, b);
		c=Math.min(c,d);
		return Math.min(a, c);
	}



	static HashMap<Integer,Integer> Hash(int A[])
	{
		HashMap<Integer,Integer> mp=new HashMap<>();
		for(int a:A)
		{
			int f=mp.getOrDefault(a,0)+1;
			mp.put(a, f);
		}
		return mp;
	}
	static long mul(long a, long b)
	{
		return ( a %mod * 1L * b%mod )%mod;
	}
	static void swap(int A[],int a,int b)
	{
		int t=A[a];
		A[a]=A[b];
		A[b]=t;
	}


	static int find(int a)
	{
		if(par[a]<0)return a;
		return par[a]=find(par[a]);
	}
	static void union(int a,int b)
	{
		a=find(a);
		b=find(b);
		if(a!=b)
		{
			par[a]+=par[b];
			par[b]=a;
		}
	}
	static boolean isSorted(int A[])
	{
		for(int i=1; i<A.length; i++)
		{
			if(A[i]<A[i-1])return false;
		}
		return true;
	}

	static boolean isDivisible(StringBuilder X,int i,long num)
	{
		long r=0;
		for(; i<X.length(); i++)
		{
			r=r*10+(X.charAt(i)-'0');
			r=r%num;
		}
		return r==0;
	}    



	static int lower_Bound(int A[],int low,int high, int x) 
	{ 
		if (low > high) 
			if (x >= A[high]) 
				return A[high]; 

		int mid = (low + high) / 2; 

		if (A[mid] == x) 
			return A[mid]; 

		if (mid > 0 && A[mid - 1] <= x && x < A[mid]) 
			return A[mid - 1]; 

		if (x < A[mid]) 
			return lower_Bound( A, low, mid - 1, x); 

		return lower_Bound(A, mid + 1, high, x); 
	} 

	static String f(String A)
	{
		String X="";
		for(int i=A.length()-1; i>=0; i--)
		{
			int c=A.charAt(i)-'0';
			X+=(c+1)%2;
		}
		return X;
	}

	static void sort(long[] a) //check for long
	{
		ArrayList<Long> l=new ArrayList<>();
		for (long i:a) l.add(i);
		Collections.sort(l);
		for (int i=0; i<a.length; i++) a[i]=l.get(i);
	}

	static String swap(String X,int i,int j)
	{
		char ch[]=X.toCharArray();
		char a=ch[i];
		ch[i]=ch[j];
		ch[j]=a;
		return new String(ch);
	}

	static int sD(long n)  
	{  

		if (n % 2 == 0 )  
			return 2;  

		for (int i = 3; i * i <= n; i += 2) {  
			if (n % i == 0 )  
				return i;  
		}  

		return (int)n;  
	}  

	static void setGraph(int N)
	{
		tot=new int[N+1];
		partial=new int[N+1];
		D=new int[N+1];
		P=new int[N+1][(int)(Math.log(N)+10)];
		set=new boolean[N+1];
		g=new ArrayList[N+1];
		for(int i=0; i<=N; i++)
		{

			g[i]=new ArrayList<>();		
			D[i]=Integer.MAX_VALUE;
			//D2[i]=INF;
		}
	}



	static  long pow(long a,long b)
	{
		//long mod=1000000007;
		long pow=1;
		long x=a;
		while(b!=0)
		{
			if((b&1)!=0)pow=(pow*x)%mod;
			x=(x*x)%mod;
			b/=2;
		}
		return pow;
	}

	static long toggleBits(long x)//one's complement || Toggle bits
	{
		int n=(int)(Math.floor(Math.log(x)/Math.log(2)))+1;

		return ((1<<n)-1)^x;
	}

	static int countBits(long a)
	{
		return (int)(Math.log(a)/Math.log(2)+1);
	}

	static long fact(long N)
	{ 
		long n=2; 
		if(N<=1)return 1;
		else
		{
			for(int i=3; i<=N; i++)n=(n*i)%mod;
		}
		return n;
	}

	static int kadane(int A[])
	{
		int lsum=A[0],gsum=A[0];
		for(int i=1; i<A.length; i++)
		{
			lsum=Math.max(lsum+A[i],A[i]);
			gsum=Math.max(gsum,lsum);
		}
		return gsum;
	}

	static void sort(int[] a) {
		ArrayList<Integer> l=new ArrayList<>();
		for (int i:a) l.add(i);
		Collections.sort(l);
		for (int i=0; i<a.length; i++) a[i]=l.get(i);
	}

	static boolean isPrime(long N)
	{
		if (N<=1)  return false; 
		if (N<=3)  return true; 
		if (N%2 == 0 || N%3 == 0) return false; 
		for (int i=5; i*i<=N; i=i+6) 
			if (N%i == 0 || N%(i+2) == 0) 
				return false; 
		return true; 
	}
	static void print(char A[])
	{
		for(char c:A)System.out.print(c+" ");
		System.out.println();
	}
	static void print(boolean A[])
	{
		for(boolean c:A)System.out.print(c+" ");
		System.out.println();
	}
	static void print(int A[])
	{
		for(int a:A)System.out.print(a+" ");
		System.out.println();	
	}
	static void print(long A[])
	{
		for(long i:A)System.out.print(i+ " ");
		System.out.println();

	}
	static void print(ArrayList<Integer> A)
	{
		for(int a:A)System.out.print(a+" ");
		System.out.println();
	}

	static int i()
	{
		return in.nextInt();
	}

	static long l()
	{
		return in.nextLong();
	}

	static int[] input(int N){
		int A[]=new int[N];
		for(int i=0; i<N; i++)
		{
			A[i]=in.nextInt();
		}
		return A;
	}

	static long[] inputLong(int N)     {
		long A[]=new long[N];
		for(int i=0; i<A.length; i++)A[i]=in.nextLong();
		return A;
	}

	static long GCD(long a,long b) 
	{
		if(b==0)
		{
			return a;
		}
		else return GCD(b,a%b );
	}

}
//class node1
//{
//	long L,R,cnt;
//	boolean leaf;
//	node1(long l,long r,long c,boolean x)
//	{
//		this.leaf=x;
//		this.L=l;
//		this.R=r;
//		this.cnt=c;
//	}
//}


//Code For FastReader
//Code For FastReader
//Code For FastReader
//Code For FastReader
class FastReader
{
	BufferedReader br;
	StringTokenizer st;
	public FastReader()
	{
		br=new BufferedReader(new InputStreamReader(System.in));
	}

	String next()
	{
		while(st==null || !st.hasMoreElements())
		{
			try
			{
				st=new StringTokenizer(br.readLine());
			}
			catch(IOException e)
			{
				e.printStackTrace();
			}
		}
		return st.nextToken();
	}

	int nextInt()
	{
		return Integer.parseInt(next());
	}

	long nextLong()
	{
		return Long.parseLong(next());
	}

	double nextDouble()
	{
		return Double.parseDouble(next());
	}

	String nextLine()
	{
		String str="";
		try
		{
			str=br.readLine();
		}
		catch (IOException e)
		{
			e.printStackTrace();
		}
		return str;
	}

}