#include<iostream>
#include<iomanip>
#include<cmath>
using namespace std;
int main() {
    int n = 0, T = 0;
    cin >> n;
    for (int i = 0; i < n; i++)//循环，每一次救援
    {
        double x = 0, y = 0, p = 0;
        cin >> x >> y >> p;//
        double s = sqrt(x * x + y * y);//算屋顶到原点的距离
            double t = (2 * s) / 50 + p*1.5;//来回各一躺＋上车下车
            T += ceil(t);//t向上取整
            
    }
    cout <<T<< endl;
    return 0;
}