#include <iostream>
#include <cmath>
using namespace std;
 
int main() {
    double x;
    int n;
    double S = 0;
 
    cout << "Nhap gia tri x: ";
    cin >> x;
    cout << "Nhap gia tri n: ";
    cin >> n;
    if (n % 2 == 0) {  
        S = 2016 * x;  
 
        for (int i = 2; i <= n; i++) {
            S += pow(x, i) / (i - 1);
        }
    } else {  
        S = 0;
    }
 
    cout << "Gia tri cua bieu thuc S = " << S << endl;
 
    return 0;
}

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