import math
import sys

sys.setrecursionlimit(10 ** 6)
from typing import List, Tuple

int1 = lambda x: int(x) - 1
input = lambda: sys.stdin.readline().rstrip('\n')
ii = lambda: int(input())
vi = lambda: list(map(int, input().split()))
vi1 = lambda: list(map(int1, input().split()))


def dbg(*args, **kwargs):
    print(*(repr(arg) for arg in args), *(f'{k}: {repr(v)}' for k, v in kwargs.items()),
          sep='; ', file=sys.stderr, flush=True)


def main():
    r, p, q = vi()
    a, b, c, d = vi()

    lo = 0
    hi = r + 1

    def ok(v):
        if a + b + c + d < 3 * v:
            return False
        return q * (max(v - a, 0) + max(v - b, 0) + max(v - c, 0)) + v * p <= r

    while lo + 1 != hi:
        mi = (lo + hi) // 2
        if ok(mi):
            lo = mi
        else:
            hi = mi

    return lo


def _start():
    if (ret := main()) is not None:
        print(*ret) if isinstance(ret, List) or isinstance(ret, Tuple) else print(ret)


if __name__ == '__main__':
    _start()