#include<cstdio>
#include<iostream>
#define LL long long
using namespace std;
int main(){
    LL n,A,B;
    cin>>n>>A>>B;
    LL last,cur,ans=0;
    cin>>last;
    for(int i=1;i<n;i++){
        scanf("%lld",&cur);
        if(A*(cur-last)<B) ans+=A*(cur-last);
        else ans+=B;
        last = cur;
    }
    cout<<ans<<endl;
    return 0;
}