#include <bits/stdc++.h>
int arr[100010];
int main() {
  int n, m, k;
  while (scanf("%d%d%d", &n, &m, &k) != EOF) {
    for (int i = 0; i < n; i++) {
      scanf("%d", &arr[i]);
    }
    long long ans = 0;
    if (n % 2) {
      if (m > n / 2) {
        long long a = (long long)m / (n / 2 + 1) * k;
        arr[n] = arr[0];
        for (int i = 0; i < n; i++, i++) {
          if (arr[i] < arr[n]) {
            arr[n] = arr[i];
          }
        }
        ans = arr[n] > a ? a : arr[n];
      }
    }
    printf("%I64d\n", ans);
  }
  return 0;
}
