/**
* In the name of Allah
* We are nothing and you're everything
* Ya Muhammad!
**/
#include <bits/stdc++.h>
#include "fish.h"
using namespace std;
using ll = long long;
using ull = uint64_t;
#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()
//#define int long long
const char nl = '\n';
const int mx = 301;
const ll inf = 0x3f3f3f3f3f3f3f3fll;
const int mod = 1e9+7;
ll dp[mx][10][10], p[mx][10];
long long max_weights(int N, int M, vector<int> X, vector<int> Y,
vector<int> W) {
for (int i = 0; i < M; ++i) {
p[X[i]][Y[i]+1] += W[i];
}
for (int i = 0; i < N; ++i) {
for (int j = 1; j <= 9; ++j)p[i][j] += p[i][j-1];
}
if (N == 1)return p[0][9];
memset(dp, 0, sizeof dp);
ll res = 0;
for (int i = 0; i <= 9; ++i) {
for (int j = 0; j <= 9; ++j) {
if (i > j)dp[1][i][j] = p[1][i]-p[1][j];
else dp[1][i][j] = p[0][j]-p[0][i];
res = max(res, dp[1][i][j]);
}
}
for (int i = 2; i < N; ++i) {
for (int j = 0; j <= 9; ++j)
for (int k = 0; k <= 9; ++k)
for (int l = 0; l <= 9; ++l) {
ll cur = dp[i-1][k][l];
if (k > j) {
cur += p[i][k]-p[i][j];
}
if (j > k && j > l)cur += p[i-1][j]-p[i-1][max(l, k)];
dp[i][j][k] = max(cur, dp[i][j][k]);
res = max(res, cur);
}
}
return res;
}
// int main() {
// int n, m;
// cin >> n >> m;
// vector<int> x(m), y(m), w(m);
// for (int i = 0; i < m; ++i)cin >> x[i] >> y[i] >> w[i];
// cout << max_weights(n, m, x, y, w);
// }
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