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