#include<stdio.h>
int main()
{
    double n=5;
    double xi[5]={1,2,3,4,5};
    double yi[5]={3,4,5,6,8};
    double sum_xiyi=0,sum_xi=0,sum_yi=0,square_sum=0;
    int  i,j,k;
    double a,b;
    for(i=0;i<5;i++)
    {
        sum_xiyi+=xi[i]*yi[i];
        sum_xi+=xi[i];
        sum_yi+=yi[i];
        square_sum+=xi[i]*xi[i];
    }
    b=(n*sum_xiyi-sum_xi*sum_yi)/(n*square_sum-(sum_xi*sum_xi));
    a=(sum_yi-b*sum_xi)/n;
    printf("%lf\n%lf",a,b);

}