R, P, Q = (int(x) for x in input().split())
A, B, C, D = (int(x) for x in input().split())

low = 0
high = R // P + 1
while low + 1 < high:
    mid = (low + high) // 2
    m = min(A, B, C, mid)
    a, b, c = A - m, B - m, C - m
    if (a + b + c + D) // 3 >= mid - m and mid * P + (max(mid - m - a, 0) + max(mid - m - b, 0) + max(mid - m - c, 0)) * Q <= R:
        low = mid
    else:
        high = mid

print(low)