#include <bits/stdc++.h>
#define pb push_back
#define fst first
#define snd second
#define fore(i,a,b) for(int i=a,pao=b;i<pao;++i)
#define SZ(x) ((int)x.size())
#define ALL(x) x.begin(),x.end()
#define mset(a,v) memset((a),(v),sizeof(a))
#define FIN ios::sync_with_stdio(0);cin.tie(0);cout.tie(0)
using namespace std;
typedef long long ll;
const int MAXN=305,MAXY=15;
const ll INF=1e18;
ll pref[MAXN][MAXY],dp[MAXN][MAXY][MAXY];
long long max_weights(int N, int M, std::vector<int> X, std::vector<int> Y, std::vector<int> W) {
fore(i,0,M){
pref[X[i]+1][Y[i]+1]+=W[i];
}
fore(i,0,N+1){
fore(j,1,10){
pref[i][j]+=pref[i][j-1];
//~ cout<<pref[i][j]<<" ";
}
//~ cout<<endl;
}
fore(i,1,N+1){
fore(j,1,10){
fore(k,1,10)dp[i][j][k]=-INF;
}
}
ll ans=0;
dp[0][0][0]=0;
fore(i,1,N+1){
fore(l,0,10){
fore(m,0,10){
fore(r,0,10){
ll value=dp[i-1][l][m];
if(m>r)value+=pref[i][m]-pref[i][r];
if(max(l,m)<r)value+=pref[i-1][r]-pref[i-1][max(l,m)];
dp[i][m][r]=max(dp[i][m][r],value);
//~ cout<<i<<" "<<l<<" "<<m<<" "<<r<<"="<<value<<endl;
ans=max(ans,dp[i][m][r]);
}
}
}
}
return ans;
}
