#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using ld = long double;
using mint = modint998244353;

int main() {
  ll N, K, X; cin >> N >> K >> X;
  vector<ll> A(N);
  for (auto &x: A) cin >> x;
  vector<ll> s(N + 1), t(N + 1);
  t[0] = X;
  for (int i = 0; i < N; i++) {
    s[i + 1] = min(s[i], t[i]) + A[i];
    t[i + 1] = min(t[i], s[i] + X) + K;
  }
  cout << min(s[N], t[N]) << endl;
}