#include <bits/stdc++.h>
using namespace std;
int main(){
    int n;
    scanf("%d",&n);
    double sum=0;
    for(int i=1;i<=n;i++){
        double x,y;
        int p;
        scanf("%lf%lf%d",&x,&y,&p);
        double dis=sqrt(x*x+y*y);
        sum+=dis/50+p+dis/50+p*0.5;
    }
    printf("%d\n",int(ceil(sum)));
    return 0;
}