#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cmath>
#include <map>
#include <stack>
#include <queue>
#include <cstdlib>
#include <numeric>


/*
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MMMP <!!! dMMMb "?$$P" uMMM>;!!! 4MMMMMMMr`:::::::::.........:::::::::::::
MMP';!!! ;MMMMMMn,.".uMMMMM ;!!! MMMMMMMMM,`::::::::::::::::::::::::::::::
MM ;!!!! MMMMMMMMMMMMMMMMMM !!!! MMMMMMMMMb `:::::::::::::::::::::::::::::
M" !!!! uMMMMMMMMMMMMMMMMMP !!! ;MMMMMMMMMMx :::::::::::::::::::::::::::::
P.!!!! ,MMMMMMMMMMMMMMMMMM ,!!! MMMMMMMMMMMMx`::::::::::::::::::::::::::::
!!!!> MMMMMMMMMMMMMMMMMMP !!!',MMMMMMMMMMMMM `:::::::::::::::::::::::::::
*/


int main()
{
	long long n, a, b;

	std::cin >> n >> a >> b;

	std::vector<long long> v(n);

	for (int i = 0; i < n; i++) {
		std::cin >> v[i];
	}

	long long ans = 0;
	for (int i = 0; i < n - 1; i++) {
		if ((v[i + 1] - v[i]) * a < b) {
			ans += (v[i + 1] - v[i]) * a;
		} else {
			ans += b;
		}
	}

	std::cout << ans << std::endl;

	return 0;
}

Measured memory_bytes: 1024