n=int(input())
s=[tuple(map(float,input().split())) for i in range(n)]
t=[tuple(map(float,input().split())) for i in range(n)]
s.sort()
t.sort()
l=0
r=10**9+1
d=lambda a,b:(a[0]-b[0])*(a[0]-b[0])+(a[1]-b[1])*(a[1]-b[1])
for _ in range(100):
  m1=l+(r-l)/3
  m2=r-(r-l)/3
  c1=sum(d((s[i][0]*m1,s[i][1]*m1),t[i]) for i in range(n))
  c2=sum(d((s[i][0]*m2,s[i][1]*m2),t[i]) for i in range(n))
  if c1>c2:
    l=m1
  else:
    r=m2
print(l)