N,M,K,S,T = map(int,input().split())
roka = []
from_list = [[S,0]]
to_list = []
ans = -1

def calc(from_list,to_list):
    next_list = []
    for to in to_list:
        tmp_n = [to[1],float("inf")]
        for frm in from_list:
            step = abs(to[0]-frm[0])+frm[1]
            if tmp_n[1]>step:
                tmp_n[1]=step
        next_list.append(tmp_n[:])
    return next_list[:]

for i in range(M):
    roka.append(list(map(int,input().split())))
roka.sort()

now_buil = 1
for rk in roka:
    if rk[0]==now_buil:
        to_list.append(rk[1:])
    else:
        now_buil+=1
        if rk[0]>now_buil:
            break
        else:
            from_list = calc(from_list,to_list)
            to_list = [rk[1:]]
else:
    if now_buil+1 == N and M != 0:
        from_list = calc(from_list,to_list)
        ans = float("inf")
        for frm in from_list:
            step = abs(T-frm[0])+frm[1]
            if ans>step:
                ans=step
print(ans)