#include<bits/stdc++.h>
using namespace std;
constexpr int64_t mod=1e9+7;

int main()
{
  int64_t k,a,b;
  cin>>k>>a>>b;
  if(b-a<=2){
    cout<<k+1;
    return 0;
  }
  k-=a-1;
  cout<<a+(b-a)*(k/2)+k%2;
}