#include<fstream>
using namespace std;
ifstream f("koba.in");
ofstream g("koba.out");
int t1,t2,t3,t4,n,i,s,p,no,pd,sd,nrp,v[1005],poz[1005],sum[1005];
int main()
{f>>n>>t1>>t2>>t3;
t1%=10;
t2%=10;
t3%=10;
s=t1+t2+t3;
p=t1*100+t2*10+t3;
v[p]=1;
sum[p]=s;
poz[p]=3;
for(i=4;i<=n;++i)
{t4=(t3+t1*t2)%10;
t1=t2;
t2=t3;
t3=t4;
s+=t3;
p=t1*100+t2*10+t3;
if(no==1)
	continue;
if(v[p]==0)
{v[p]=1;
sum[p]=s;
poz[p]=i;
}
else
{sd=s-sum[p];
pd=i-poz[p];
nrp=(n-i)/pd;
s+=nrp*sd;
i+=nrp*pd;
no=1;
}}
g<<s<<'\n';
return 0;
}