#include "fish.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
void chmax(ll& x, ll y) {
x = max(x, y);
}
long long max_weights(int N, int M, std::vector<int> X, std::vector<int> Y,
std::vector<int> W) {
vector<vector<ll>> a(N + 3, vector<ll>(N + 3));
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) {
a[i][j] += a[i][j - 1];
}
}
vector<vector<vector<ll>>> dp(N + 2, vector<vector<ll>>(N + 2, vector<ll>(2)));
for (int i = 2; i <= N; ++i) {
for (int j = 0; j <= N; ++j) {
for (int k = 0; k < j; ++k) {
dp[i][j][1] = max({dp[i][j][1], dp[i - 1][k][1] + a[i - 1][j] - a[i - 1][k]});
}
for (int k = 0; k <= N; ++k) {
if (i == 2) {
dp[i][j][1] = a[i - 1][j];
dp[i][j][0] = a[i - 1][j];
} else {
dp[i][j][1] = max(dp[i][j][1], max(dp[i - 2][k][1], dp[i - 2][k][0]) + a[i - 1][max(j, k)]);
dp[i][j][0] = max(dp[i][j][0], max(dp[i - 2][k][1], dp[i - 2][k][0]) + a[i - 1][max(j, k)]);
}
}
for (int k = j; k <= N; ++k) {
dp[i][j][0] = max({dp[i][j][0], max(dp[i - 1][k][0], dp[i - 1][k][1]) + a[i][k] - a[i][j]});
}
}
}
// for (int i = 1; i <= N; ++i) {
// for (int j = 0; j <= N; ++j) {
// for (int k = 0; k < 2; ++k) {
// cerr << dp[i][j][k] << " ";
// }
// cerr << "\n";
// }
// cerr << "\n";
// }
// cerr << "\n";
ll res = 0;
for (int i = 0; i <= N; ++i) {
for (int k = 0; k < 2; ++k) {
res = max(res, dp[N][i][k]);
}
}
return res;
}
