#include<bits/stdc++.h>
using namespace std;
struct node{
    double x,y,p;
}a[10005];
int main(){
    int n;
    double time=0;
    cin>>n;
    for(int i=1;i<=n;i++)cin>>a[i].x>>a[i].y>>a[i].p;
    for(int i=1;i<=n;i++)time+=2*sqrt(abs(a[i].x*a[i].x)+abs(a[i].y*a[i].y))/50.0+a[i].p*1.5;
    cout<<ceil(time);
    return 0;
}