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

long long inf = 1001001001001001001;

int main() {
    long long N;
    int A,B;
    cin >> N >> A >> B;
    long long ans = inf;
    ans = min(ans,(A-B)*(N-2)+B-B-A);
    ans = min(ans,(B-A)*((N-1)/2)+B-(B+A)*(N/2));
    ans = min(ans,(B-A)*(N/2)-B-(B+A)*((N-1)/2));
    ans = min(ans,(A-B)*(N-1)-B);
    if(N%2 == 0) {
        ans = min(ans,(B-A)*((N-1)/2)-B-(B+A)*((N-1)/2)+A-B);
    }
    cout << ans << endl;
}