#include <bits/stdc++.h>   using namespace std;   int n, a, b, c;   int main() {     ios_base::sync_with_stdio(false);     cin >> n >> a >> b >> c;     if (n == 1)       cout << 0 << endl;     else if (c >= min(a, b))       cout << (n - 1) * min(a, b) << endl;     else       cout << min(a, b) + (n - 2) * c << endl;     return 0;   }   