using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;
class Program
{
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static string[] SList(long n) => Enumerable.Repeat(0, (int)n).Select(_ => ReadLine()).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var c = NList;
        var (n, k, x) = (c[0], c[1], c[2]);
        var a = NList;
        var dp = new long[2][];
        for (var i = 0; i < dp.Length; ++i) dp[i] = Enumerable.Repeat(long.MaxValue / 2, n + 1).ToArray();
        dp[0][0] = 0;
        for (var i = 0; i < n; ++i)
        {
            dp[0][i + 1] = Math.Min(dp[0][i], dp[1][i]) + a[i];
            dp[1][i + 1] = Math.Min(dp[0][i] + k + x, dp[1][i] + k);
        }
        WriteLine(Math.Min(dp[0][n], dp[1][n]));
    }
}