#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pll = pair<ll, ll>;
using dd = long double;
namespace {
static bool constexpr dbg = 0;
ll constexpr N = -1;
ll n, a, b, c;
void init() { cin >> n >> a >> b >> c; }
void solve() {
  if (n == 1)
    cout << 0;
  else if (n == 2)
    cout << min(a, b);
  else
    cout << (min(a, b) + (n - 2) * min({a, b, c}));
}
}  // namespace
int main() {
  if (!dbg) {
    std::ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
  }
  cout << fixed << setprecision(20);
  init();
  solve();
  return 0;
}
