#include <stdio.h>
#include <math.h>
int main(){
	int n,i,m,v=50;
	double a,b,c,t,sum=0;
	scanf("%d",&n);
	for(i=1;i<=n;i++){
		scanf("%lf %lf %d",&a,&b,&m);
		c=sqrt(a*a+b*b);
		t=2*c/v+1.5*m;
		if(m%2==0){
			t=t;
			}else{
			t=t+0.5;
			}
		sum+=t;
}
	printf("%.0lf",sum);
	return 0;
}