#include<stdio.h>
#include <math.h>

int main()
{
	double length;
	int i,n,num;
	double t1,t2,a,b;
	double t=0;
	scanf("%d", &n);
	for (i=0; i<n; i++)
	{
		scanf("%lf %lf %d", &a, &b, &num);//有问题 
		length=sqrt(pow(a,2)+pow(b,2));
		t1=length/50*2;
	
		t2=1.5*num;
	
		t+=t1+t2;
	}
//	int result=ceil(t);
	printf("%d", t);
	return 0;
 }