# 全探索で間に合うか
# c and b

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

ans = 0
for c in range(N//10+1):
    b_max = (N-c*10)//5
    for b in range(b_max+1):
        a = (N-c*10-b*5)//3
        calc = a*A+b*B+c*C
        ans = max(ans, calc)
        #print('a', a, 'b', b, 'c', c, 'calc', calc, 'ans', ans)
print(ans)