import heapq

n, m, k, t = map(int,input().split())
modoru = [[(-1,-1) for j in range(m)] for i in range(n)]
for i in range(k):
	a, b, c, d = map(int,input().split())
	a -= 1
	b -= 1
	modoru[a][b] = (c, d)

tmax = 601

d = [10 ** 18] * n * m * tmax
d[200] = 0

pq = [(d[200], 200)]

r1 = m * tmax

while pq:
	tmp, nowv = heapq.heappop(pq)
	fnv = nowv
	nowt = nowv % tmax
	nowv //= tmax
	b = nowv % m
	a = nowv // m
	if tmp > d[fnv]: continue
	for xx, yy in [(-1, 0), (1, 0), (0, 1), (0, -1)]:
		x = a + xx
		y = b + yy
		if 0 <= x < n and 0 <= y < m:
			dist = tmp
			targ = x*r1 + y*tmax + min(nowt+1, tmax-1)
			if dist < d[targ]:
				d[targ] = dist
				heapq.heappush(pq, (dist, targ))
	if modoru[a][b][0] == -1: continue
	c, dd = modoru[a][b]
	dist = tmp + dd
	targ = a*r1 + b*tmax + max(0, nowt-c+1)
	if dist < d[targ]:
		d[targ] = dist
		heapq.heappush(pq, (dist, targ))

ans = 10 ** 18
for ts in range(tmax):
	if ts - 200 > t: continue
	ans = min(ans, d[(n-1)*r1 + (m-1)*tmax + ts])

if ans == 10 ** 18:
	print(-1)
else:
	print(ans)