#include<bits/stdc++.h>

#include<ctime>

#define int long long

#define itn int

#define ull unsigned long long

#define ll long long

using namespace std;

int n;

struct test{
	
	int s,v,t;
	
}a[1000005];

bool cmp(test a,test b){
	
	return b.t*a.v>a.t*b.v;
	
}

signed main(){

	ios::sync_with_stdio(false);
	
	cin.tie(0);
	
	cout.tie(0);
	
	cin>>n;
	
	for(int i=1;i<=n;i++) cin>>a[i].s>>a[i].v>>a[i].t;
	
	sort(a+1,a+n+1,cmp);
	
	int ans=0,now=0;
	
	for(int i=1;i<=n;i++){
		
//		cout<<a[i].s<<' '<<a[i].v<<' '<<a[i].t<<"\n";
		
		now+=a[i].t;
		
		ans+=a[i].s-now*a[i].v;
		
	}
	
	cout<<ans<<"\n";

	return 0;

}
//296+28+128