#include<bits/stdc++.h>

using namespace std;

#define endl '\n'
#define hh cout<<endl;
#define No cout<<"No"<<endl;
#define Yes cout<<"Yes"<<endl;
#define NO cout<<"NO"<<endl;
#define YES cout<<"YES"<<endl;


typedef long long ll;


ll ksm(ll a,ll b)
{
    if(!b)
        return 1;
    ll ans = 1;
    while(b)
    {
        if(b&1)
            ans *= a;
        a *= a;
        b /= 2;
    }
    return ans;
}
struct node
{
    ll s,v,t;
}a[1000001];
ll n;
bool cmp(node a,node b)
{
    return b.t*a.v>b.v*a.t;
}
void solve()
{
	cin>>n;
    ll i;
    for(i=1;i<=n;i++)
        cin>>a[i].s>>a[i].v>>a[i].t;
    sort(a+1,a+1+n,cmp);
    ll s = 0,w = 0;
    for(i=1;i<=n;i++)
    {
        w += a[i].t;
        // printf("a[i].t=%d\n",a[i].t);
        s += a[i].s-w*a[i].v;
        // printf("%d %d\n",w,s);
    }
    cout<<s<<endl;
    return;
}
signed main()
{
    int T = 1;
    // cin>>T;
    while(T--)
        solve();
    return 0;
}