n,m,k,t = map(int,input().split())
targ = n+m-2-t

if targ <= 0:
	print(0)
	exit()

ans = 10 ** 18

for i in range(k):
	a, b, c, d = map(int,input().split())
	c -= 1
	if c == 0: continue
	ans = min(ans, ((targ+c-1)//c) * d)

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