#include "fish.h"
#include <bits/stdc++.h>
using namespace std;
#define NL '\n'
#define EL cout << NL
#define FOR(i,n) for(int i = 0; i < (n); i++)
#define FORS(i,s,n) for(int i = (s); i < (n); i++)
#define PRINTV(v) for(auto a:v) {cout << a << " ";} EL;
#define PRINTVV(v) for(auto a:v) {PRINTV(a);}
#define f first
#define s second
#define all(v) (v).begin(),(v).end()
#define STRP(p) "{" << (p).f << "," << (p).s << "}"
#define PRINTVP(v) for(auto a:v) {cout << STRP(a) << " ";} EL;
#define PRINTVVP(v) for(auto a:v) {PRINTVP(a);}
typedef long long ll;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef pair<ll,ll> pl;
typedef vector<pl> vpl;
typedef vector<vpl> vvpl;
long long max_weights(int N, int M, std::vector<int> X, std::vector<int> Y,
std::vector<int> W) {
vl left(N);
vl right(N);
FOR(i,M) {
if (X[i] == 0) left[Y[i]] = W[i];
else right[Y[i]] = W[i];
}
if (N == 2) {
return max(right[0]+right[1],left[0]+left[1]);
}
ll ans = 0;
FOR(i,N) {
ans += right[i];
}
ll psum = ans;
FOR(i,N) {
psum += left[i]-right[i];
ans = max(ans,psum);
}
return ans;
}
