package chelper;

import static misc.Stuff.min;

import io.InputReader;
import io.OutputWriter;
import misc.SimpleSavingChelperSolution;


public class A extends SimpleSavingChelperSolution {

  public void solve(int testNumber, InputReader in, OutputWriter out) {
    wrapSolve(testNumber, in, out);
  }

  @Override
  public void solve(int testNumber) {
    int n = in.nextInt() - 1;
    int a = in.nextInt();
    int b = in.nextInt();
    int c = in.nextInt();

    long ans = min(a * n, b * n);

    if (n >= 1) {
      ans = min(ans, a + c * (n - 1), b + c * (n - 1));
    }

    out.println(ans);
  }
}