#include <bits/stdc++.h>
typedef long long ll;
using namespace std;
ll n, sum;
struct task{
	ll s, v, t;
	int read(){
		return scanf("%lld%lld%lld", &s, &v, &t);
	}
	bool operator<(const task &t1)const{
		return t * t1.v < t1.t * v;
	}
}a[1000010];
signed main()
{
    scanf("%lld", &n);
    for(int i = 1 ; i <= n ; i++){
    	a[i].read();
    	sum += a[i].s;
	}
	sort(a + 1, a + 1 + n);
	ll t = 0;
	for(int i = 1 ; i <= n ; i++)
		sum -= (t += a[i].t) * a[i].v;
	printf("%lld", sum);
    exit(0);
}