#include<stdio.h>
#include<string.h>
#define N 20000
void creare(char s[N],int v[N])
{
	int n,i,k=0;
	n=strlen(s);
	k=0;
	v[k++]=n;
	for(i=0;i<n;i++)
		v[k++]=s[i]-'0';
}
void afis(int v[N])
{
	int i;
	if(v[v[0]]==0)
		printf("%d",0);
	else
		for(i=v[0];i>=1;i--)
			printf("%d",v[i]);
	printf("\n");
}
void suma(int v1[N],int v2[N],int sum[N])
{
	int i,t=0,k=1;
	for(i=1;i<=v1[0]&&i<=v2[0];i++)
	{
		sum[k++]=(v1[i]+v2[i]+t)%10;
		t=(v1[i]+v2[i]+t)/10;
	}
	while(i<=v1[0])
	{
		sum[k++]=(v1[i]+t)%10;
		t=(v1[i]+t)/10;
		i++;
	}
	while(i<=v2[0])
	{
		sum[k++]=(v2[i]+t)%10;
		t=(v2[i]+t)/10;
		i++;
	}
	if(t)
		sum[k++]=t;
	sum[0]=k-1;
}
void scad(int v1[N],int v2[N],int dif[N])
{
	int i,k=1,j;
	//inters(v1,v2);
	for(i=1;i<=v1[0]&&i<=v2[0];i++)
		if(v1[i]-v2[i]>=0)
		{
			dif[k++]=v1[i]-v2[i];
			if(v1[i]-v2[i]==0&&i==v1[0])
			{
			//	v1[0]--;
				//k--;
			}
		}
		else
		{
			dif[k++]=v1[i]+10-v2[i];
			for(j=i+1;v1[j]==0&&j<=v1[0];j++)
				v1[j]=9;
			v1[j]--;
			if(v1[j]==0&&j==v1[0])
				v1[0]--;
		}
	while(i<=v1[0])
	{
		dif[k++]=v1[i];
		i++;
	}
	dif[0]=k-1;
}
void mul1(int A[N], int B)  
{  
    int i, t = 0;  
    for (i = 1; i <= A[0] || t; i++, t /= 10)  
            A[i] = (t += A[i] * B) % 10;  
    A[0] = i - 1;  
}
void mul2(int A[N], int B[N])  
{  
    int i, j, t, C[N];  
    memset(C, 0, sizeof(C));  
    for (i = 1; i <= A[0]; i++)  
    {  
        for (t=0, j=1; j <= B[0] || t; j++, t/=10)  
			C[i+j-1]=(t+=C[i+j-1]+A[i]*B[j])%10;  
        if (i + j - 2 > C[0]) C[0] = i + j - 2;  
    }  
    memcpy(A, C, sizeof(C));  
}void inv(char s[N])
{
	int i,j;
	char aux;
	for(i=0,j=strlen(s)-1;i<j;i++,j--)
	{
		aux=s[i];
		s[i]=s[j];
		s[j]=aux;
	}
}
void read_solve()
{
	char s1[N],s3[3]="1",s4[3]="2";
	int v1[N],sum[N],dif1[N],unu[100],doi[100],dif2[N];
	scanf("%s%s",&s1);
	if(s1[0]=='1'&&strlen(s1)==1)
	{
		printf("2\n");
		return;
	}
	inv(s1);
	creare(s1,v1);
	creare(s3,unu);
	creare(s4,doi);
	scad(v1,unu,dif1);
	scad(v1,doi,dif2);
	mul2(dif1,dif2);
	mul1(dif1,2);
	mul1(v1,4);
	suma(v1,dif1,sum);
	afis(sum);
}
int main()
{
	freopen("sarpe.in","r",stdin);
	freopen("sarpe.out","w",stdout);
	read_solve();
	return 0;
}