n = int(input())
a1, b1 = map(int, input().split())
a2, b2 = map(int, input().split())
a3, b3 = map(int, input().split())

ma = max(a1 * a2, a2 * a3, a3 * a1)
ma = min(ma, n)
dp = [0] * (ma + 1)
for i in range(ma + 1):
    if i >= a1:
        dp[i] = max(dp[i], dp[i - a1] + b1)
    if i >= a2:
        dp[i] = max(dp[i], dp[i - a2] + b2)
    if i >= a3:
        dp[i] = max(dp[i], dp[i - a3] + b3)

ans = 0
for i in range(ma + 1):
    for a, b in [(a1, b1), (a2, b2), (a3, b3)]:
        tot = dp[i]
        tot += (n - i) // a * b
        ans = max(ans, tot)

print(ans)