#include <stdio.h>

int main()
{
FILE *in = fopen("koba.in","r");
FILE *out = fopen("koba.out","w");

int n,t1,t2,t3,x,s;
char A[10][10][10];

fscanf(in,"%d%d%d%d",&n,&t1,&t2,&t3);

t1 = t1%10;
t2 = t2%10;
t3 = t3%10;
s = t1+t2+t3;
n=n-3;

int i,j,k;

for (i=0;i<=9;i++)
for (j=0;j<=9;j++)
for (k=0;k<=9;k++)
A[i][j][k] = (i+j*k)%10;

while (n)
{
n--;
x = A[t3][t2][t1];
t1 = t2;
t2 = t3;
t3 = x;
s += t3;
}
fprintf(out,"%d",s);
}