#include<stdio.h>
#include<math.h>
 
struct Coordinate{
	int x;
	int y;
};
 
int main(void)
{ double a,b,c,d,e,f,Shortest_distance,m,n,g,h,i;
  scanf("%d %d %d %d %d %d %d",&a,&b,&c,&d,&e,&f);
  struct Coordinate A={a,b};
  struct Coordinate B={c,d};
  struct Coordinate C={e,f};
  m=(double)(B.y-C.y)/(B.x-C.x);
  ///n=(double)B.y-m*B.x;
  ///g=m*A.x-A.y+n;
  ///h=fabs(g);
  ///i=sqrt(m*m+1.0);
  ///Shortest_distance=h/i;
  printf("%lf",m);
  return 0;
}

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