#include <iostream>
#include <cmath>
using namespace std;
int main(){
	int n; //屋顶数量
	int x,y;//坐标轴
	int num;//人数
	double time=0;
	double lon;
	cin>>n;
	for(int i=0;i<n;i++){
		cin>>x>>y;
		cin>>num;
		lon = sqrt(x*x+y*y);
		time+=lon/50*2+num*1.5;
	}
	time=ceil(time);
	cout<<time;
	
	return 0;
}