#include <iostream>
typedef long long ll;
using namespace std;
bool ll_is_valid(ll t, ll N, ll x, ll y)
{
return t / x + (t - x) / y >= N;
}
ll f(ll N, ll x, ll y)
{
ll R = 1;
while (!ll_is_valid(R,N,x,y)) R *= 2;
ll L = R / 2;
while(R - L > 1)
{
ll M = (L + R) / 2;
if (!ll_is_valid(M,N,x,y)) {L = M;}
else {R = M;}
}
return R;
}
int main()
{
ll N,x,y;
cin >> N >> x >> y;
if(x > y) swap( x, y );
cout << f(N, x, y) << std::endl;
}
str, str1: string;
arr: array [1..256] of byte;
i, i2: byte;
err: integer;
begin
readln(str);
str := concat(str, ' ');
for i := 1 to length(str) do
begin
if (str[i] = ' ') then
begin
i2 := i2 + 1;
val(str1, arr[i2], err);
str1 := '';
end
else
str1 := concat(str1, str[i]);
end;
for i := 1 to length(str) do
write(arr[i]:4);
end.