#include <iostream>
using namespace std;
const int maxn = 1000 * 1000 + 10;
int a[maxn];
int main() {
    int n, x;
    cin >> n >> x;
    for(int i=0;i<=n;++i)
        cin >> a[i];
    
    int p = 0;
    for(int i=n;i>=0;--i)
       p = p * x + a[i];
    
    cout << p << endl;
    
    return 0;
}