#include <iostream>
#include <cmath>
using namespace std;
int main()
{
long long n, a, b, x, x0, fatique = 0;
cin >> n >> a >> b;
cin >> x0;
n--;
while (n--) {
cin >> x;
fatique += min(a * (x - x0), b);
x0 = x;
}
cout << fatique;
}
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