#include <iostream>
#include <vector>
#include <fstream>
using namespace std;

int main()
{
    ifstream cin("koba.in");
    ofstream cout("koba.out");
    int n,a,b,c;
    cin>>n>>a>>b>>c;
    vector <int> v;
    v.push_back(a%10);
    v.push_back(b%10);
    v.push_back(c%10);
    for(int i=3;i<1005;i++)
    {
        v.push_back((v[i-1]+v[i-2]*v[i-3])%10);
//cout<<v[i];
    }

        int st,dr,steag=0;
    for(int i=0;i<=1002;i++)
    {
        a=v[i];
        b=v[i+1];
        c=v[i+2];
        for(int j=i+1;j<=1002;j++)
        {
            if(v[j]==a && v[j+1]==b && v[j+2]==c)
            {
                st=i;
                dr=j;
                steag=1;
                break;
            }
        }
        if(steag)
            break;
    }
    ///for(int )
   // cout<<st<<" "<<dr;
    int s=0;
    for(int i=0;i<st;i++)
        s+=v[i];
    int s1=0;
    for(int i=st;i<=dr+2;i++)
        s1+=v[i];
    n-=st;
    s+=s1*(n/(dr+3-st));
    for(int i=st;i<st+n%(dr+3-st);i++)
    {
        s+=v[i];
    }
    cout<<s;
    return 0;
}