placare1

#include <fstream>
using namespace std;
ifstream f("placare1.in");
ofstream g("placare1.out");
long long int L,A,B,H,r,n;

int main()
{
    f>>L>>A>>B;
    r=L%A,n=1;
    while(r!=0)
        r=(L-(A-r))%A,++n;
    H=n*B;
 	r=L%B,n=1;
    while(r!=0)
        r=(L-(B-r))%B,++n;
    if(n*A>H)
        H=n*A;
    g<<H;
    return 0;
}