#include<iostream>
#include<cstdio>
typedef long long ll;
const ll N=100000000;
using namespace std;
ll x[N];
int main()
{
	ll ans=0;
	ll n,a,b;
	cin>>n>>a>>b;
	for(int i=1;i<=n;i++)
	{
		cin>>x[i];
		if(i!=1)
		{
			int d=x[i]-x[i-1];
			if(d*a<b)
				ans+=d*a;
			else ans+=b;
		}
	}
	cout<<ans;
	return 0;
}