#include <iostream>`
using namespace std;`

int main(){`
    int m,n;
    cin>>m>>n;
        for(int k=m*n;k>=m+n-1;k--){
            int i=k;
            while(i%m!=0&&i%n!=0){
                i=i-m;
                if(i<=0)
                    {break;}
                }
            if(i<=0){
                    cout<<k;
                    break;
                }
            }
        return 0;
}