import sys
input = sys.stdin.readline

N=int(input())
P=[list(map(float,input().split())) for i in range(N)]
P2=[list(map(float,input().split())) for i in range(N)]

sx=0
sy=0

sx2=0
sy2=0

for x,y in P:
    sx+=x
    sy+=y

for x,y in P2:
    sx2+=x
    sy2+=y

mx=sx/N
my=sy/N

mx2=sx2/N
my2=sy2/N

MAX1=0
MAX2=0

for x,y in P:
    MAX1=max(MAX1,(mx-x)*(mx-x)+(my-y)*(my-y))


for x,y in P2:
    MAX2=max(MAX2,(mx2-x)*(mx2-x)+(my2-y)*(my2-y))

print((MAX2**(1/2))/(MAX1**(1/2)))