#include <bits/stdc++.h> 
using namespace std;
#include <ios>
#include <iomanip>
  
int main() {
  int a, b, c;
  cin >>a>>b>>c;
  int count = (a-0)*c;
  for(int i=1; i<=a;i++){
    int k=i;
   count = min(count,k*b+(a-k)*c);
  }
  cout << count;
}