#include <stdio.h>
#include <math.h>
int main()
{
    int n;
    int x, y;
    scanf("%d", &n);
    int r;
    double sum=0.0;
  
while(n--)
    {
        scanf("%d %d %d", &x, &y,& r);
        double t , s;
        s = sqrt( x * x + y * y);
        t = s / 50 *2.0+ 1.5*r;
        sum += t;
    }

 printf("%d", (int)ceil(sum));
        
	return 0;
}