#include <stdio.h>
#include <math.h>
int main(){
    int n,x,y,people,i;
    double juli;
    double t;
    double time=0;
    scanf("%d",&n);
    for(i=0;i<n;i++){
        scanf("%d %d %d",&x,&y,&people);
        juli=sqrt(x*x+y*y);
        t=2*juli/50+(1+0.5)*people;
        time=time+t;
    }
    int quzheng=(int)time;
    if(time>quzheng)
        printf("%d",quzheng+1);
    else
        printf("%d",quzheng);
    return 0;
}