#include <iostream>
#include <iomanip>
#include <cstdlib>
#include <cmath>

using namespace std;

void readVector(double *vec, int length) {
    for (int i = 0; i < length; i++) {
        cin >> vec[i];

        if (cin.fail()) {
            cout << "Nespravny vstup." << endl;
            exit(-1);
        }
    }
}





int main(int argc, char **argv) {
    int vecLength = 0;


    cin >> vecLength;

    if (cin.fail()) {
        cout << "Nespravny vstup." << endl;
        return -1;
    }

    if (vecLength <= 0) {
        cout << "Nespravny vstup." << endl;
        return -1;
    }

    if (vecLength <= 0) {
        cout << "Nespravny vstup." << endl;
        return -1;
    }

    double *vecA = new double[vecLength];
    double *vecB = new double[vecLength];

    readVector(vecA, vecLength);
    readVector(vecB, vecLength);

    double mult = 0.0;
    for (int i = 0; i < vecLength; i++) {
        mult += vecA[i] * vecB[i];
    }

    double sumSquareA = 0.0;
    for (int i = 0; i < vecLength; i++) {
        sumSquareA += vecA[i] * vecA[i];
    }

    double sumSquareB = 0.0;
    for (int i = 0; i < vecLength; i++) {
        sumSquareB += vecB[i] * vecB[i];
    }

    double csm = mult / (sqrt(sumSquareA) * sqrt(sumSquareB));

    cout << "CSM: " << fixed << setprecision(3) << csm << endl;

    return 0;
}