use proconio::{input, marker::Usize1};

fn main() {
    input! {
        h: usize, w: usize, sx: Usize1, sy: Usize1, n: usize,
        xyc: [(Usize1, Usize1, i64); n],
    }

    let mut prev = (sx, sy);
    let mut dp = [0, -1];
    for &(x, y, c) in &xyc {
        let mut ndp = [0, -1];
        if dp[0] >= 0 && check((x, y), prev) {
            ndp[0] = ndp[0].max(dp[0] + c);
        }
        if dp[1] >= 0 {
            ndp[0] = ndp[0].max(dp[1] + c);
        }
        ndp[1] = ndp[1].max(dp[0]).max(dp[1]);
        dp = ndp;
        prev = (x, y);
    }
    let ans = dp.iter().max().unwrap();
    println!("{ans}");
}

fn check(now: (usize, usize), prev: (usize, usize)) -> bool {
    now.0 == prev.0
        || now.1 == prev.1
        || now.0 + now.1 == prev.0 + prev.1
        || now.0 + prev.1 == prev.0 + now.1
}