#include <bits/stdc++.h>
using namespace std;
int main()
{
	double n,x,y,t,s;
	cin >> n;
    for(int i = 0;i < n;++i)
    cin>>x>>y>>t;
	s+=1.5*t+2*sqrt(x * x + y * y)/50;
    cout<<int(ceil(s));
	return 0;
}