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
input_str = input().split()

n = int(input_str[0])
a = int(input_str[1])
b = int(input_str[2])
c = int(input_str[3])
d = int(input_str[4])
start = int(input_str[5])
len = int(input_str[6])

events = []
for i in range(n):
    event_str = input().split()
    events.append((int(event_str[0]), int(event_str[1]), i))

max_t = events[-1][0] + 2

answer = -1

min_talk_event = None
max_talk_event = None

for start_day in range(max_t):


    if start_day != 0 and min_talk_event == None:
        start_day = event[0][0] - len + 1
    if min_talk_event != None and max_talk_event != None and  start_day > min_talk_event[0] + 1:
        next_min_index = min_talk_event[2] + 1
        next_max_index = max_talk_event[2] + 1
        if next_min_index < len(events) and next_max_index < len(events):
            start_day += min(events[next_min_index][0] - start_day, events[next_max_index][0] - start_day + 1)


    sum = start
    is_ok = True

    min_talk_assigned = False

    for event in events:
        if event[0] >= start_day and event[0] < start_day + len:
            sum += c if event[1] == 1 else -d
            if not min_talk_assigned:
                min_talk_event = event
                min_talk_assigned = True
            max_talk_assigned = True
        else:
            sum += a if event[1] == 1 else -b

        if sum < 0:
            is_ok = False
            break

    if is_ok:
        answer = start_day
        break

print(answer)