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
n,a,b,c,d,start,len=list(map(int,input().split()))
t=[]
event=[]
event1=[]
delts=int(start)
def reading():
    global delts, event, t, event1
    k = len + 2
    for i in range(n):
        x, y = list(map(int, input().split()))
        if y == 1:
            delts += a
            event.append(c)
            event1.append(a)
        else:
            delts -= b
            event.append(-d)
            event1.append(-b)
        k+=1
        t.append(x)
reading()
res=int(start)
z1=0
while (t[z1]<len):
    res+=event[z1]
    z1+=1
    if z1==n:
        break
def main():
    global res, z1
    z0=0
    i=0
    bes=0
    m=max(t)
    while (bes>=0) and (z0<n) :
        if res >=0:
            kol=int(bes)
            for j in t[z0:z1-1]:
                kol+=event[j]
                if kol<0:
                    break
            else:
                print(i+1)
                return
        if t[z0]==i:
            p=-event[z0]+event1[z0]
            res=res-p
            bes=bes+p
            z0+=1
        if z1<n:
            if t[z1]==i+len:
                res=res+event[z1]
                z1+=1
        i+=1
    if z0==n:
        if delts>=0:
            print(m+1)
            return
    print(-1)
    return
main()