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#include <iostream>
//#include <chrono>
//#include <fstream>
//#include <bits/stdc++.h>
#include <algorithm>

#define mp make_pair
#define pb push_back
#define eb emplace_back
#define f first
#define s second
#define sz(x) (int)x.size()
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)

using namespace std;

typedef unsigned long long ull;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pi;
typedef pair<ll, ll> pl;

int main() {
    /*ifstream cin("in.txt");
    ofstream cout("out.txt");
    auto start_time = chrono::high_resolution_clock::now();*/

    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);


    int x, y, n;
    cin >> n >> x >> y;
    int l = -1, r = max(x, y) * n;
    while (l + 1 < r) {
        int mid = (l + r) / 2;
        if (mid / x + mid / y < n - 1)
            l = mid;
        else
            r = mid;
    }
    cout << r + min(x, y) << endl;


    /*auto end_time = chrono::high_resolution_clock::now();
    chrono::duration<double> duration = end_time - start_time;
    cout << duration.count() << "\n";
    cin.close();
    cout.close();*/
    return 0;
}