import sys
input = sys.stdin.readline

H,W,sx,sy,N=list(map(int,input().split()))

X=[list(map(int,input().split())) for i in range(N)]

DP=[0]*N

x,y,c=X[0]

if x==sx or y==sy or (x+y)==(sx+sy) or (x-y)==(sx-sy):
    DP[0]=c

if N>=2:
    DP[1]=X[1][2]

for i in range(N):
    x0,y0,c0=X[i]

    if i+1<N:
        x,y,c=X[i+1]
        if x==x0 or y==y0 or (x+y)==(x0+y0) or (x-y)==(x0-y0):
             DP[i+1]=max(DP[i+1],DP[i]+c)

    if i+2<N:
        DP[i+2]=max(DP[i+2],DP[i]+X[i+2][2])




print(max(DP))