#include <stdio.h>

int N;
int A[1001];
typedef long long ll;
int main(){
        scanf("%d",&N);
        ll xysum = 0;
        ll xsum = N*(N+1)/2;
        ll x2sum = 0;
        ll ysum = 0;
        for(int x = 1; x <= N; x++){
                scanf("%d",A+x);
                x2sum += x*x;
                ysum += A[x];
                xysum += x*A[x];
        }
        double a = (N*xysum-xsum*ysum)/(double)(N*x2sum-xsum*xsum);

        double b = (x2sum*ysum-xysum*xsum)/(double)(N*x2sum-xsum*xsum);

        printf("%f %f\n",b+a, a);

        double cost = 0;
        for(int x = 1; x <= N; x++){
                double mody = a*x+b;
                cost += ((double)A[x]-mody)*((double)A[x]-mody);
        }
        printf("%f\n",cost);
}