#include "bits/stdc++.h"
using namespace std;
int n, m;
const int N=200;
int par[N];
vector<pair<int, pair<int, int>>> edges;
int find(int x){
if(par[x]==x) return x;
return par[x]=find(par[x]);
}
bool join(int x, int y){
if(find(x)==find(y)) return 0;
par[find(x)]=find(y);
return 1;
}
int main(){
cin.tie(0)->sync_with_stdio(0);
// freopen("input.txt", "r", stdin);
// freopen("output.txt", "w", stdout);
cin >> n >> m;
for(int i=0; i<n; i++) par[i]=i;
for(int i=0; i<m; i++){
int u, v, c, t; cin >> u >> v >> c >> t;
edges.push_back({c, {u, v}});
}
int ans=0;
sort(edges.begin(), edges.end());
for(auto p:edges){
int u=p.second.first;
int v=p.second.second;
if(join(u, v)) ans+=p.first;
}
cout << ans*ans;
}
