#include <iostream>
using namespace std;
#define fin cin
#define fout cout
const int NMAX = 300001;
long long g[NMAX];
int main()
{
int n, m;
fin >> n >> m;
for(int i = 1; i <= m; ++i){
int u, w, pr;
fin >> u >> w >> pr;
g[u] += pr;
g[w] += pr;
}
long long smax = 0;
for(int i = 1; i <= n; ++i){
//fout << g[i] << " ";
smax = max(smax, g[i]);
}
fout << smax;
return 0;
}
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