#include <bits/stdc++.h>
using namespace std;

long long n, a, b, m;

int main() {
	cin >> n >> a >> b;

	m = min(a * (1 - n) - b * (n % 2), a * (n - 1) - b * n);

	if(n % 2 == 0)
		m = min(m, a * (3 - n) - b * 2);

	cout << m << endl;
}