import numpy as np
n = int(input())
[[a1, b1], [a2, b2], [a3, b3]] = [list(map(int, input().split())) for _ in range(3)]
assert n > 0 and a1 > 0 and a2 > 0 and a3 > 0 and b1 > 0 and b2 > 0 and b3 > 0
assert n < (1 << 64) and n // min(a1, a2, a3) * max(b1, b2, b3) < (1 << 64)
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
print(
	max(
		np.max(((s - j * a3) // a1) * b1 + i * b2 + j * b3)
		for i, j, s in zip(
			range(a1),
			map(lambda s: np.arange(0, min(a1, s // a3 + 1), dtype=np.uint64), range(n, -1, -a2)),
			range(n, -1, -a2),
		)
	)
)