#include <cstdlib>
#include <iostream>
using namespace std;
int main()
{
int n, x;
cin >> n >> x;
int a[n+1];
for (int i = n; i >= 0; --i)
{
cin >> a[i];
}
int s = a[n];
for (int i = 1; i <= n; ++i)
{
s *= x;
s += a[n-i];
}
cout << s << endl;
}
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