#include <stdio.h>

int main(){
  int n,i,lnt,k;
  unsigned long map[6][100],tmin=0,tmax=0,t;
  FILE *in,*out;
  in=fopen("input.txt", "r");
  out=fopen("output.txt", "w+");
  fscanf(in,"%d ",&n);
//printf("\n\n\n\n %d",n);
  fscanf(in,"%d ",&lnt);
//printf(" %d",lnt);
  for(i=0; i<n; i++){
//printf("\n");
    for(t=0; t<6; t++){
      fscanf(in,"%d",&map[t][i]);
//printf("%d ",map[t][i]);
    }
  }
//printf("\n");
  for(i=0;i<n;i++){
    if(tmax<map[5][i]) tmax=map[5][i];
  }
//printf("\n %d",tmax);
  for(t=0;t!=tmax;t++){
    for(i=0;i<n;i++){
      for(k=0;k<n;k++){
	if((( map[0][i]+(map[2][i]-map[0][i])/(map[5][i]-map[4][i])*(t-map[4][i]) - map[0][k]-(map[2][k]-map[0][k])/(map[5][k]-map[4][k])*(t-map[4][k]))^2 + (map[1][i]+(map[3][i]-map[1][i])/(map[5][i]-map[4][i])*(t-map[4][i]) - map[1][k]-(map[3][k]-map[1][k])/(map[5][k]-map[4][k])*(t-map[4][k]))^2<=lnt^2) && n!=k && t>=map[4][i] && t>=map[4][k] && t<=map[5][i] && t<=map[5][k]){
	  fprintf(out,"%d",t);
	  fclose(in); fclose(out);
	  return 0;
	}
      }
    }
  }
  fprintf(out,"%d",-1);
  fclose(in); fclose(out);
  return 0;
}