#include<bits/stdc++.h>
using namespace std;

int main(){
	int n;
	cin >> n;
	int x,y,num;
	double distance;
	double time = 0;
	for (int i = 1;i <= n;i++){
		cin >> x >> y >> num;
		distance = sqrt(x*x +y*y);
		time += 2*distance/50 + 1.5*num;
	}
	cout << ceil(time) << endl;
}