Mars

n, a, b, w, h = map(int, input().split())

def check(d):
    hor = w // (a + 2 * d)
    ver = h // (b + 2 * d)
    total = hor * ver
    hor = h // (a + 2 * d)
    ver = w // (b + 2 * d)
    total = max(total, hor * ver)
    return total >= n

l = 0
r = max(w, h) // 2 + 2

while r - l > 1:
    d = l + (r - l) // 2
    if check(d):
        l = d
    else:
        r = d

print(l)