#include <iostream>
#include <cmath>
using namespace std;
int main(){
int n;
double a,b,c,t=0;
cin >> n;
for(int i=0;i<n;i++){
cin >> a >> b >> c;
t = t + sqrt(a*a+b*b) * 2 / 50 + 1.5 * c;
}
printf("%.0f",ceil(t));
return 0;
}