#include <iostream>
#include <vector>
#include "cmath"

using namespace std;

unsigned const int N = 0;

double Vypocet(double vc1[N], double vc2[N])
{
    for (int i=0; i < N; i++)
    {
    double x = 0, x1 = 0, y = 0, y1 = 0, sc = 0, sc1 = 0;
    x += pow(vc1[i], 2);
    x1 = sqrt(x);
    y += pow(vc2[i], 2);
    y1 = sqrt(x);
    sc += (vc1[i]*vc2[i]);
    sc1 = sc / (x1*y1);
    return sc1;
    }
}

int main()
{

    double *vctra = new double[N];
    double *vctrb = new double[N];

    for(int i = 0; i <= N; i++)
    {
        if(!cin.fail())
        {
        cin >> N;
        cin >> vctra[i];
        cin >> vctrb[i];
        }
        else
        {
        cout << "Nespravny vstup." << endl;
        delete [] vctra;
        delete [] vctrb;
        return -1;
        }
    }



    cout << "CSM: " << Vypocet(vctra, vctrb);



    return 0;
}