#include <stdio.h>
#include <math.h> 
#define M 1000
struct jiu{
    int k;
	double i,j,n;
}j[M];
int main()
{
    int i,n,m;
    scanf("%d",&n);
    for(i=1;i<=n;i++)
    {
        scanf("%lf%lf%d",&j[i].i,&j[i].j,&j[i].k);
        m=sqrt(pow(j[i].i,2)+pow(j[i].j,2));
        j[i].n=2*m/50+j[i].k*1.5;
    }    	
	j[0].n=0;
    for(i=1;i<=n;i++)
    {
		j[0].n+=j[i].n;
	}    	
	printf("%d\n",(int)(ceil(j[0].n)));
	return 0;
}