/* run this code with "conn-test < connectivity" */
#include <stdlib.h>
#include <sys/times.h>
#include <stdio.h>

struct tms begin_time, end_time;

typedef long *long_p;
typedef double *double_p;

int main ()
{
  long **neighbors;
  double **coefficients;
  long *local_neighbors;
  double* local_coefficients;
  double sum;

  long *neighbor_size;
  
  double *vec1;
  double *vec2;

  long i, j, k, n;
  scanf ("%ld", &n);
  
  neighbors = (long **) malloc (n * sizeof (long_p));
  coefficients = (double **) malloc (n * sizeof (double_p));
  neighbor_size = (long *) malloc (n * sizeof (long));

  for (i = 0; i < n; i++)
    {
      scanf ("%ld", &k);
      neighbors[i] = (long *) malloc (k * sizeof (long));
      /* we'll zero the coefficients */
      coefficients[i] = (double *) calloc (k, sizeof (double));
      neighbor_size[i] = k;
      for (j = 0; j < k; j++)
	  scanf ("%ld", neighbors[i] + j);
    }
  
  vec1 = (double *) calloc (n, sizeof (double));

  (void) times(&begin_time);
  
  for (k = 0; k < 100; k++)
    {
      vec2 = (double *) calloc (n, sizeof (double));
      for (i = 0; i < n; i++)
	{
	  long m = neighbor_size[i];
	  local_neighbors = neighbors[i];
	  local_coefficients = coefficients[i];
	  if (m == 7)
	    vec2[i] = 
	        local_coefficients[0] * vec1[local_neighbors[0]]
	      + local_coefficients[1] * vec1[local_neighbors[1]]
	      + local_coefficients[2] * vec1[local_neighbors[2]]
	      + local_coefficients[3] * vec1[local_neighbors[3]]
	      + local_coefficients[4] * vec1[local_neighbors[4]]
	      + local_coefficients[5] * vec1[local_neighbors[5]]
	      + local_coefficients[6] * vec1[local_neighbors[6]];
	  else if (m == 5)
	    vec2[i] = 
	        local_coefficients[0] * vec1[local_neighbors[0]]
	      + local_coefficients[1] * vec1[local_neighbors[1]]
	      + local_coefficients[2] * vec1[local_neighbors[2]]
	      + local_coefficients[3] * vec1[local_neighbors[3]]
	      + local_coefficients[4] * vec1[local_neighbors[4]];
	  else
	    {
	      sum = 0.0;
	      for (j = 0; j < m; j++)
		sum += local_coefficients[j] * vec1[local_neighbors[j]];
	      vec2[i] = sum;
	    }
	}
      free (vec2);
    }

  (void) times(&end_time);

  printf("%ld\n", (long)(end_time.tms_utime+end_time.tms_stime-begin_time.tms_utime-begin_time.tms_stime));
  return (n);
}