#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,a,x,y;
    double t1=0,t2=0,t3=0;
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>x>>y>>a;
        t1=t1+sqrt(x*x+y*y)*2/50.0;
        t2=t2+a*1;
        t3=t3+a*0.5;
        }
        cout<<ceil(t1+t2+t3);
}