#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include <map>
#include <vector>
#include <queue>
#include <deque>
#include <set>
#include <stack>
#include <algorithm>
#include <array>
#include <unordered_set>
#include <unordered_map>
#include <string>
using namespace std;

bool rcmp(int a, int b) { return a>b; }
typedef long long LL;
class mypcmp {
public:
    bool operator()(const int& a, const int& b) {
        return a<b;
    }
};



LL dp[200004];
int as[200004];
int main() {
    int n, k, x, v;
    LL s, t, i;
    scanf("%d %d %d", &n, &k, &x);
    for (i=0; i<n; i++) scanf("%d", &as[i]);
    dp[n]=0;
    s=k; s*=n; for (i=n-1; i>=0; i--) {
        dp[i]=min(as[i]+dp[i+1], s-(i+1)*k+as[i]+x);
        s=min(s, dp[i]+i*k);
    }
    printf("%lld\n", dp[0]);
    return 0;
}