#include <stdio.h>
#include <math.h>
int main()
{
	int n,a;
	double x,y,s=0;
	scanf("%d\n",&n);
	for(int i=1;i<=n;i++)
	{
		scanf("%lf %lf %d",&x,&y,&a);
		double m=sqrt(x*x+y*y);
		 s=s+(1.0/50)*(2*m)+1.5*a;
		
	}
	printf("%lf\n",ceil(s));
	return 0;
}