#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;
}