#include <iostream>
#include <cstdio>
#include <cmath>
using namespace std;

int main()
{
    int n;
    cin>>n;
    double s=0;
    for(int i=0;i<n;i++){
        double a,b;
        int c;
        cin>>a>>b>>c;
        double s1=sqrt(a*a+b*b)/50*2;
        double s2=c*1.5;
        s+=s1+s2;
    }
    cout<<ceil(s);
    return 0;
}