#include<bits/stdc++.h>
using namespace std;
int n;
double ti;
struct node{
	double x,y,juli;
	int m;
}a[1005]; 
int main(){
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>a[i].x>>a[i].y>>a[i].m;
		a[i].juli=sqrt(a[i].x*a[i].x+a[i].y*a[i].y);
	}
	for(int i=1;i<=n;i++){
		ti=ti+a[i].juli*2/50;
		ti=ti+a[i].m*1.5;
	}
	cout<<ceil(ti);
	return 0;
}