#include<iostream>
#include<cmath>
#include<cstdio>
using namespace std;
int main() {
	int n,i,p;
	float d=0,x,y,ti=0;
	cin>>n;
	for(i=1;i<=n;i++) {
		cin>>x>>y>>p;
		d=sqrt(x*x+y*y);
		ti=ti+d/50*2+1.5*p;
	}
	cout<<ceil(ti);
	return 0;
}