#include <bits/stdc++.h>
using namespace std;
void Weapons19() {
  cin.sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
}
int32_t main() {
  Weapons19();
  long long int n, m, k;
  cin >> n >> m >> k;
  vector<long long int> v(n);
  for (long long int i = 0; i < n; i++) cin >> v[i];
  if (n == 2 || n % 2 == 0) {
    cout << 0;
    return 0;
  }
  for (long long int i = 1; i < n; i++) {
    if (v[i] == v[i - 1] && v[i] == 0) {
      cout << 0;
      return 0;
    }
  }
  long long int ans = v[0];
  for (long long int i = 2; i < n; i += 2) ans = min(ans, v[i]);
  long long int times = k * (m / ((n + 1) / 2));
  cout << min(ans, times);
}
