#include "fish.h"
#include <bits/stdc++.h>
using namespace std;
long long max_weights(int N, int M, vector<int> X, vector<int> Y, vector<int> W)
{
bool ok = 1;
for (auto &i : X)
ok &= (i % 2 == 0);
if (ok)
return accumulate(W.begin(), W.end(), 0ll);
if (*max_element(X.begin(), X.end()) <= 1)
{
vector<long long> A(N), B(N);
for (int i = 0; i < M; i++)
{
if (X[i])
B[Y[i]] = W[i];
else
A[Y[i]] = W[i];
}
if (N == 2)
{
return max(A[0] + A[1], B[0] + B[1]);
}
long long mx, s;
s = mx = 0;
for (int i = 0; i < N; i++)
{
s += A[i] - B[i];
mx = max(mx, s);
}
return mx + accumulate(B.begin(), B.end(), 0ll);
}
vector<vector<long long>> dp(N + 2, vector<long long>(1));
vector<vector<long long>> A(N, vector<long long>(1));
for (int i = 0; i < M; i++)
A[X[i]][0] = W[i];
for (int i = 0; i < N; i++)
dp[i + 2][0] = max(dp[i][0] + (i ? A[i - 1][0] : 0ll) + (i == N - 1 ? 0ll : A[i + 1][0]), dp[i + 1][0] + A[i][0]);
return dp[N + 1][0];
}
