n=int(input())
dx=[]
dy=[]
for _ in range(n):
    x,y = map(float, input().split())
    dx.append(x)
    dy.append(y)
xg=sum(dx)/float(n)
yg=sum(dy)/float(n)
dmin=float('inf')
for i in range(n):
    dmin=min(dmin, ((dx[i]-xg)**2+(dy[i]-yg)**2)**0.5)

dz=[]
dw=[]
for _ in range(n):
    z,w = map(float, input().split())
    dz.append(z)
    dw.append(w)
zg=sum(dz)/float(n)
wg=sum(dw)/float(n)
dmin2=float('inf')
for i in range(n):
    dmin2=min(dmin2, ((dz[i]-zg)**2+(dw[i]-wg)**2)**0.5)
print(dmin2/dmin)