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

int main() {
    int n,i,people,x,y;
    double totalmin=0,distance,a;
    scanf("%d",&n);
    for(i=0;i<n;i++){
    scanf("%d %d %d",&x,&y,&people);
    a=x*x+y*y;
    distance=sqrt(a);
    totalmin+= 2*distance/50+1.5*people;
    }
    printf("%0.0f",ceil(totalmin));
    return 0;
}