#include <stdio.h>
#include <math.h>

int main () {
    int n,p;
    double x,y,t,s;
    scanf("%d",&n);
    for (int i=1;i<=n;i++) {
        scanf("%lf %lf %d",&x,&y,&p);
        s=sqrt(pow(abs(x),2)+pow(abs(y),2));
        t+=2*s/50.0+(1.5*p);
    }
    printf("%d",(int)ceil(t));
}