#include <iostream>
using namespace std;

int main(){
    long long n, x, y;
    cin >> n >> x >> y;
    n--;
    long long l = 0, r = n * max(x, y), m;

    while (l < r){

        m = (r + l) / 2;
        if ((m / x + m / y) < n) l = m+1;
        else r = m;

    }
    cout << r + min(x, y);

    return 0;
}