#include <fish.h>
#include <bits/stdc++.h>
#define MAX 200005
#define INF 1e12
#define ll long long
#define pii pair<int,int>
#define FastIO ios_base::sync_with_stdio(false); cin.tie(NULL);
using namespace std;
vector<pair<ll,ll> > fish;
long long dp[333][333][333];
long long a[333][333] , ps[333][333];
long long ma1[333] , ma2[333];
long long max_weights(int N, int M, std::vector<int> X, std::vector<int> Y, std::vector<int> W) {
ll ans = 0;
for (int i = 0; i < M; i++) a[X[i]+1][Y[i]+1] += W[i];
for (int i = 1; i <= N; i++) for (int j = 1; j <= N; j++) ps[j][i] = ps[j-1][i]+a[j][i];
for (int i = 2; i <= N+1; i++) {
for (int h1 = 0; h1 <= N; h1++) {
ll ma = 0;
for (int i = 0; i <= N; i++) ma1[i] = ma2[i] = 0;
for (int k = 0; k <= N; k++) ma = max(ma , dp[i-1][k][h1]);
for (int h2 = 0; h2 <= N; h2++) ma1[h2] = max(((h2 == 0) ? 0 : ma1[h2-1]) , dp[i-1][h2][h1]+ps[h2][i-1]-ps[h1][i-1]);
for (int h2 = N-1; h2 >= 0; h2--) ma2[h2] = max(ma2[h2+1] , dp[i-1][h2+1][h1]+ps[h2+1][i-1]-ps[h1][i-1]);
for (int h2 = 0; h2 <= N; h2++) dp[i][h1][h2] = max(ma , max(ma1[h2] , ma2[h2]));
}
}
for (int i = 0; i <= N; i++) {
for (int j = 0; j <= N; j++) ans = max(ans , dp[N+1][i][j]);
}
return ans;
}
