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
p = min(m, max(a1, a2, a3))
dp = [0] * m
r = 0
for i in range(p):
	dp[i] = r = max(
		dp[i - a1] + b1 if i >= a1 else 0,
		dp[i - a2] + b2 if i >= a2 else 0,
		dp[i - a3] + b3 if i >= a3 else 0,
		r,
	)
for i in range(p, m):
	dp[i] = r = max(
		dp[i - a1] + b1,
		dp[i - a2] + b2,
		dp[i - a3] + b3,
		r,
	)
print(r + w * b1)