#include<iostream>
#include<math.h>
using namespace std;

float suma(int, float);

int main() {

	float x;
	int n;

	cout << "Unesite realan broj" << endl;
	cin >> x;
	cout << "Unesite prirodan broj" << endl;
	cin >> n;



	cout<<suma(n, x);



	system("pause>0");
	return 0;
}

float suma(int n, float x) {
	float broj = 0;
	float suma = 0;


	for (int i = 1; i <= n; i++) {

		broj = pow(x, i);

		suma = suma + cos(broj);

	}
	return suma;
}