N = int(input())
H = int(input())

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

ans = 10**18

def calc(coef, xp, yp):
    a2 = yp/(xp+1e-9)
    a1 = (yp-H)/(xp+1e-9)
    return coef[0] + a1*coef[1] + (a1*a1)*coef[2] +\
        a2*coef[3] + (a2*a2)*coef[4]


for xp in range(501):
    for yp in range(501):
        coef = [0]*5
        for x, y in X:
            if (x <= xp and y <= yp) or (x > xp and y > yp):
                coef[0] += y**2
                coef[3] += - 2*x*y
                coef[4] += x**2
            else:
                coef[0] += (y - H)**2
                coef[1] += - 2*x*(y - H)
                coef[2] += x**2
        #ans = min(calc(coef, xp, yp), ans)
        #ans = min(calc(coef, xp, yp+1), ans)
        #ans = min(calc(coef, xp+1, yp), ans)
        #ans = min(calc(coef, xp+1, yp+1), ans)
        xtest = H/(- coef[3]/(2*(coef[4]+1e-9)) + coef[1]/(2*(coef[2]+1e-9)))
        ytest = xtest * (- coef[3]/(2*(coef[4]+1e-9)))
        ans = min(calc(coef, min(max(xtest,xp),xp+1), min(max(ytest,yp),yp+1)), ans)


print(ans)