#include <bits/stdc++.h>
using namespace std;
long long n, m, a[10005], b, c, ans = 0, minn = 100000;
int main() {
  cin >> n >> m >> b;
  for (int i = 1; i <= n; ++i) {
    cin >> a[i];
    if (minn > a[i] && i % 2 == 1) {
      minn = a[i];
    }
  }
  c = n / 2 + 1;
  if (n % 2 == 0 || c > m)
    ;
  else {
    ans = m / c * b;
    ans = min(minn, ans);
  }
  cout << ans;
  return 0;
}
