def linier_fitting(permulation):

    n = len(permulation)
    x=y=xy=xx=0

    for i in range(n):
        xy+=(i+1) * permulation[i]
        x+=(i+1)
        y+=permulation[i]
        xx+=(i+1)**2

    d1=n*xy-x*y
    n1=n*xx-x**2
    d2=xx*y-xy*x
    n2=n*xx-x**2

    cross=d1/n1
    intercept=d2/n2
    #傾きがcross,切片がintercept = 等差数列の交差がcross,初項がintercept+cross
    return (cross,intercept)

def abs_diff_pow(permulation,cross_diff,intercept):
    diff_sum=0.0
    for i in range(len(permulation)):
        diff_sum+=( permulation[i] - ((i+1)*cross_diff+intercept) )**2
    return diff_sum

num = int(input())
permulation=list(map(float,input().split()))

coeff=linier_fitting(permulation)
cross=coeff[0]
intercept=coeff[1]
init_term=cross+intercept

print(init_term,cross)
diff_sum=abs_diff_pow(permulation,cross,intercept)
print(diff_sum)