n = int(input())
[[a1, b1], [a2, b2], [a3, b3]] = [list(map(int, input().split())) for _ in range(3)]
amin, bmin = min(a1, a2, a3), min(b1, b2, b3)
assert n > 0 and amin > 0 and bmin > 0
if a2 * b1 < a1 * b2:
	a1, b1, a2, b2 = a2, b2, a1, b1
if a3 * b1 < a1 * b3:
	a1, b1, a3, b3 = a3, b3, a1, b1
w = max(n // a1 - a2 - a3, 0)
m = n - w * a1 + 1
dp = [-1 << 60] * 2048
r = 0
for i in range(m):
	dp[i & 2047] = r = max(
		dp[(i - a1) & 2047] + b1,
		dp[(i - a2) & 2047] + b2,
		dp[(i - a3) & 2047] + b3,
		r,
	)
print(r + w * b1)