#include<bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
using P = pair<ll,ll>;
using vl = vector<ll>;
using Map = map<ll,ll>;
using T = tuple<ll,ll,ll>;
using vvl = vector<vector<ll>>;
#define all(v) v.begin(), v.end()
#define prt(v) cout<<(v)<<"\n";
#define fi(v) get<0>(v)
#define se(v) get<1>(v)
#define th(v) get<2>(v)
#define endl "\n"
template <typename T> bool chmax(T &a, const T &b){if (a<b){a=b;return 1;}return 0;}
template <typename T> bool chmin(T &a, const T &b){if (a>b){a=b;return 1;}return 0;}
const ll INF=1LL<<60;
const ll MOD=1000000007;

//dp[i][j]はそれぞれiグラム、jグラム買うときの最小価格
vector<vector<ll>> dp(500, vector<ll>(500, INF));

signed main(void){
    cin.tie(0);cout.tie(0);ios::sync_with_stdio(false);
    ll N;
    cin >> N;
    ll A;
    cin >> A;
    ll B;
    cin >> B;
    vector<ll> X(N,0);
    for(ll i=0;i<N;++i)cin>>X[i];
    ll ans=0;
    for(ll i=1;i<N;++i){
        ans+=min(A*(X[i]-X[i-1]),B);
    }
    prt(ans)

    return 0;
}

#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp> // Common file
//#include <ext/pb_ds/tree_policy.hpp>
//#include <functional> // for less
#define PI acos(-1.0)
#define eps 1e-9
#define ll long long
#define ull unsigned long long
#define nl printf("\n")
#define sf scanf
#define pf printf
#define INF (ll)1e15
#define mod 1000000007

///#define isValid(n,m,nx,ny)nx>=0&&nx<n&&ny>=0&&ny<m
///int kx[]={1, 1, -1, -1, 2, 2, -2, -2}; //knight moves
///int ky[]={2,-2,  2, -2, 1,-1,  1, -1}; //knight moves
///int dx[]={1,-1,0,0,1,-1,1,-1};//eight direction
///int dy[]={0,0,1,-1,1,-1,-1,1};//eight direction
 
///using namespace __gnu_pbds;
using namespace std;
 
///inline double toRad(double deg){return deg*PI/180;}
///inline double toDeg(double rad){return rad*180/PI;}
///typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> new_data_set;
 
const int S=123456;
int main()
{
    #ifndef ONLINE_JUDGE
    //freopen("input.txt","r",stdin);
    #endif
    ll n,a,b;
    while(sf("%lld %lld %lld",&n,&a,&b)==3)
    {
        ll ara[n+5];
        for(int i=0;i<n;i++)sf("%lld",&ara[i]);

        ll ans=0;
        for(int i=0;i<n-1;i++)
        {
            ll dis=ara[i+1]-ara[i];
            if(dis*a<=b)ans+=(dis*a);
            else ans+=b;
        }
        pf("%lld\n",ans);
    }
    return 0;
}
 









 


























