N = int(input())
AB = [list(map(int, input().split())) for _ in range(3)]

INF = 1<<60

top, bottom = 0, 1
a, b = -1, -1
for A, B in AB:
    if bottom*B > top*A:
        top, bottom = B, A
        a, b = A, B

ans = 0

if 10**7 < N:
    rem = N-10**7
    n = (rem+a-1)//a
    ans = b*n
    N -= n*a

dp = [-INF]*(N+1)
dp[0] = 0
for i in range(N+1):
    for A, B in AB:
        if i+A <= N:
            dp[i+A] = max(dp[i+A], dp[i]+B)
ans += max(dp)

print(ans)