#include <bits/stdc++.h>
#include <stdio.h>
#include <algorithm>
#include <vector>
#include <iostream>

using namespace std;

int x,y;

int f(int k){

int ans;

if(x>y){
    ans=(k-y)/x+(k-y)/y+1;
}else{
    ans=(k-x)/x+(k-x)/y+1;
}

return ans;

}

int main(){
    freopen ("Input.txt","r",stdin);
    freopen ("Output.txt","w",stdout);
    int n,m;
    scanf("%d%d%d",&n,&x,&y);
    int l=0;
    int r=2000000000;
    while(r-l>1){
        m=l+(r-l)/2;
        if(f(m)>=n){
            r=m;
        }else{
            l=m;
        }
    }
    printf("%d",r);
return 0;
}