There are two main kinds of events in the life of top-model: fashion shows and photo shoots. Participating in any of these events affects the rating of appropriate top-model. After each photo shoot model's rating increases by *a* and after each fashion show decreases by *b* (designers do too many experiments nowadays). Moreover, sometimes top-models participates in talk shows. After participating in talk show model becomes more popular and increasing of her rating after photo shoots become *c* and decreasing of her rating after fashion show becomes *d*.

Izabella wants to participate in a talk show, but she wants to do it in such a way that her rating will never become negative. Help her to find a suitable moment for participating in the talk show. 

Let's assume that model's career begins in moment 0. At that moment Izabella's rating was equal to *start*. If talk show happens in moment *t* if will affect all events in model's life in interval of time [*t*..*t* + *len*) (including *t* and not including *t* + *len*), where *len* is duration of influence.

Izabella wants to participate in a talk show, but she wants to do it in such a way that her rating will not become become negative before talk show or during period of influence of talk show. Help her to find a suitable moment for participating in the talk show.
In first line there are 7 positive integers *n*, *a*, *b*, *c*, *d*, *start*, *len* (1 ≤ *n* ≤ 3·10<sup class="upper-index">5</sup>, 0 ≤ *start* ≤ 10<sup class="upper-index">9</sup>, 1 ≤ *a*, *b*, *c*, *d*, *len* ≤ 10<sup class="upper-index">9</sup>), where *n* is a number of fashion shows and photo shoots, *a*, *b*, *c* and *d* are rating changes described above, *start* is an initial rating of model and *len* is a duration of influence of talk show.

In next *n* lines descriptions of events are given. Each of those lines contains two integers *t*<sub class="lower-index">*i*</sub> and *q*<sub class="lower-index">*i*</sub> (1 ≤ *t*<sub class="lower-index">*i*</sub> ≤ 10<sup class="upper-index">9</sup>, 0 ≤ *q* ≤ 1) — moment, in which event happens and type of this event. Type 0 corresponds to the fashion show and type 1 — to photo shoot. 

Events are given in order of increasing *t*<sub class="lower-index">*i*</sub>, all *t*<sub class="lower-index">*i*</sub> are different.
none
5 1 1 1 4 0 5
1 1
2 1
3 1
4 0
5 0
6
1 1 2 1 2 1 2
1 0
-1
10 1 1 1 2 0 10
1 1
2 1
3 0
4 0
5 1
6 1
7 1
8 1
9 1
10 1
5
def read():
	return tuple(map(int, input().split()))

def rate(t1, t2):
	s1 = l[t1 - 1][0] * a - l[t1 - 1][1] * b
	s2 = (l[t2][0] - l[t1 - 1][0]) * c - (l[t2][1] - l[t1 - 1][1]) * d
	return start + s1 + s2

n, a, b, c, d, start, length = read()

l = [(0, 0)]
for i in range(n):
	(moment, activity) = read()
	if activity == 0:
		t = (l[-1][0], 1 + l[-1][1])
	else:
		t = (1 + l[-1][0],l[-1][1])
	while len(l) <= moment:
		l.append(l[-1])
	l[moment] = t
i = 1
# print(l)
flag = True
while i <= len(l):
	flag = True
	if rate(i, i - 1) < 0:
		i += 1
		flag = False
		continue
	for j in range(length):
		if i + j >= len(l):
			break
		# else:
			# print([i, j, a, b, rate(i, i + j)])
		elif rate(i, i + j) < 0:
			flag = False
			break
	if flag:
		print(i)
		break
	i += 1
if not flag:
	print(-1)