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

ll k, ans, a, b;

int main(){
    cin >> k >> a >> b;
    if (a + 1 >= b || a > k - 1) ans = k + 1;
    else k -= a + 1, ans = b + (b - a) * (k / 2) + k % 2;
    cout << ans << endl;
}