from sys import stdin
input = stdin.readline

INF = 1<<60

def judge(a, b, c, d):
    return a == c or b == d or a+b == c+d or a-b == c-d

H, W, sx, sy, N = map(int, input().split())
query = [list(map(int, input().split())) for _ in range(N)]

query = [[sx, sy, 0]]+query

dp = [-INF]*(N+1)
dp[0] = 0
MAX = -INF
for i in range(1, N+1):
    x, y, c = query[i]
    if 2 <= i:
        MAX = max(MAX, dp[i-2]+c)
    dp[i] = MAX
    if judge(x, y, *query[i-1][:2]):
        dp[i] = max(dp[i], dp[i-1]+c)

print(max(dp))