#include<bits/stdc++.h>
using namespace std;
const int N = 1e5 + 5;
int x[N], g[N], d[N];
int main(){
int n;
cin >> n;
long long curenergy = 0, curgold = 0;
for(int i = 1; i <= n; i++){
cin >> x[i] >> g[i] >> d[i];
curgold += g[i];
curenergy += d[i];
}
int l = 1, r = n;
while(x[r] - x[l] > curenergy){
if(r - l == 1){
if(g[r] > g[l]){
curgold -= g[l];
curenergy -= d[l];
l++;
}else{
curgold -= g[r];
curenergy -= d[r];
r--;
}
}else{
if(curenergy - d[l] >= x[r] - x[l + 1] && curenergy - d[r] >= x[r - 1] - x[l]){
if(g[r] > g[l]){
curgold -= g[l];
curenergy -= d[l];
l++;
}else{
curgold -= g[r];
curenergy -= d[r];
r--;
}
}else if(curenergy - d[l] >= x[r] - x[l + 1]){
curgold -= g[l];
curenergy -= d[l];
l++;
}else if(curenergy - d[r] >= x[r - 1] - x[l]){
curgold -= g[r];
curenergy -= d[r];
r--;
}
}
}
cout << curgold << '\n';
}
