import math
n=input()
sume=[]
for i in range(0,16):
    sume.append(0)
    sume[i]=float(sume[i])
def f(x,y,v):
    x=float(x)
    y=float(y)
    return float(x*v+y)
    for i in range(-2,2):
        for j in range(-2,2):
            sume[i+2][j+2]=sume[i+5][j+5]+(y-(i*x)+j)**2
for i in range(0,n):
    t=raw_input().split(" ")
    t[0]=float(t[0])
    t[1]=float(t[1])
    for i in range(-2,2):
        for j in range(-2,2):
            sume[i+2][j+2]=sume[i+5][j+5]+(t[1]-f(i,j,t[0])**2)    
sume.sort()
print sume[0]