N = int(input())
A,B,C = map(int,input().split())

ans = 0
for i in range(101):
	for j in range(201):
		if i * 10 + j * 5 > N:continue
		tmp = i * C + j * B + (N - i * 10 - j * 5) // 3 * A
		if tmp > ans:ans = tmp
print(ans)