#include <stdio.h>
int s=0,sum=0,k,ok,i,j,p1,p2,n,t1,t2,t3,x,a[2010];
int main()
{
	freopen("koba.in","r",stdin);
	freopen("koba.out","w",stdout);
	scanf("%d%d%d%d",&n,&t1,&t2,&t3);
	a[1]=t1%10;
	a[2]=t2%10;
	a[3]=t3%10;
	t1%=10;
	t2%=10;
	t3%=10;
	for (i=4;i<=2000;i++)
	{
		x=t3;
		t3=(t3+t2*t1)%10;
		t1=t2;
		t2=x;
		a[i]=t3;
	}
	ok=0;
	for (i=1;i<=1995;i++)
	{
		for (j=i+3;j<=198&&ok!=1;j++)
            if (a[i]==a[j]&&a[i+1]==a[j+1]&&a[i+2]==a[j+2])
                p1=i,p2=j-1,ok=1;
		if (ok==1)
            break;
	}
	sum=0;
	if (p1-1>n)
		for (i=1;i<=n;i++)
			sum+=a[i];
	else
	{
		for (i=1;i<=p1-1;i++)
			sum+=a[i];
		k=(n-(p1-1))%(p2-p1+1);
		for (i=p1;i<=p1+k-1;i++)
			sum+=a[i];
		k=(n-(p1-1))/(p2-p1+1);
		s=0;
		for (i=p1;i<=p2;i++)
			s+=a[i];
		sum+=s*k;
	}
	printf("%d\n",sum);
	return 0;
}