#include <bits/stdc++.h>
using namespace std;

long long N,K,A,B,cnt,ans,num[5];
int main()
{
    ios_base::sync_with_stdio(0),cin.tie(0);
    cin >> K >> A >> B;
    if(B-A<=2){
        cout << 1+K;
        return 0;
    }
    K -= A-1;
    cout << A+(B-A)*(K/2)+(K%2);
}
