#include <stdio.h>
#include <math.h>
int main()
{
    int n,i,t,p,Sum;
    double x,y,dis,sum=0;
	scanf("%d",&n);
	for(i=1;i<=n;i++)
	{
		scanf("%lf %lf %d",&x,&y,&p);
	    t=sqrt(x*x+y*y)/50*2+1.5*p;
		sum+=t;
	}
	Sum = ceil(sum);
	printf("%d",Sum);
}