#include <fstream>

using namespace std;

int N, T1, T2, T3, S;
int x[1005];
int v[10][10][10];

void Citire () {
	ifstream fin ("koba.in");
	fin >> N >> T1 >> T2 >> T3;
	fin.close ();
	T1 %= 10;
	T2 %= 10;
	T3 %= 10;
	v[T1][T2][T3] = 3;
	x[1] = T1;
	x[2] = T1 + T2;
	x[3] = T1 + T2 + T3;
	S = x[3];
}

int Business () {
	int i, aux, per, lol;
	for (i = 4; i <= N; i++)
	{
		aux = T3;
		T3 = (T3 + T2 * T1) % 10;
		T1 = T2;
		T2 = aux;
		if (v[T1][T2][T3])
		{
			lol = v[T1][T2][T3];
			per = i - lol;
			return (S - x[lol - 1]) * ((N - lol + 1) / per) + x[lol - 1 + (N - lol + 1) % per];
		}
		else
		{
			S += T3;
			v[T1][T2][T3] = i;
			x[i] = S;
		}
	}
	return S;
}

void Scriere () {
	ofstream fout ("koba.out");
	if (N < 4) fout << x[N];
	else fout << Business ();
	fout.close ();
}

int main () {
	Citire ();
	Scriere ();
	return 0;
}