#include <bits/stdc++.h>
using namespace std;
int Rand(int x) { return rand() * rand() % x + 1; }
const int INF = 0x3f3f3f3f, N = 1000005, M = 2000005, MOD = 1e9 + 7;
int a[N];
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0), cout.tie(0);
  int n, m, k;
  cin >> n >> m >> k;
  for (int i = 1; i <= n; i++) {
    cin >> a[i];
  }
  if (n % 2 == 0) return puts("0");
  int t = n / 2 + 1;
  long long tim = 1ll * m / t * k;
  if (m < t) return puts("0");
  int minn = INF;
  k = 0;
  for (int i = 1; i <= n; i += 2) {
    if (a[i] < minn) minn = a[i], k = i;
  }
  cout << min(tim, 1ll * minn) << endl;
  return 0;
}
