#include<cstdio>
int ip,lp,s,n,x,y,z,q,a[1<<15],poz[1<<10];
int nb(int x,int y,int z)
{
    return x*100+y*10+z;
}
void rasp()
{
    if(n<=q)
    {
        for(int i=1;i<=n;i++)
            s+=a[i];
        return;
    }
    ip=nb(x,y,z);
    int saux=0;
    for(int i=poz[ip];i<=q-2;i++)
        saux+=a[i];
    for(int i=1;i<poz[ip];i++)
        s+=a[i];
    lp=q-1-poz[ip];
    n-=(poz[ip]-1);
    s+=(n/lp)*saux;
    n-=(n/lp)*lp;
    for(int i=poz[ip];i<=poz[ip]+n-1;i++)
        s+=a[i];
}
void solve()
{
    int zp;
    q=0;
    x%=10;
    y%=10;
    z%=10;
    a[++q]=x;
    a[++q]=y;
    a[++q]=z;
    poz[nb(x,y,z)]=1;
    zp=(z+x*y)%10;
    x=y;
    y=z;
    z=zp;
    while(!poz[nb(x,y,z)])
    {
        a[++q]=z;
        poz[nb(x,y,z)]=q-2;
        zp=(z+x*y)%10;
        x=y;
        y=z;
        z=zp;
    }
    rasp();
}
int main()
{
    freopen("koba.in","r",stdin);
    freopen("koba.out","w",stdout);
    scanf("%d%d%d%d",&n,&x,&y,&z);
    solve();
    printf("%d",s);
    return 0;
}