#include<stdio.h>
int main(){
    int A,B,x,y,z;
    scanf("%d %d",&A,&B);
    x=A+B;
    y=A-B;
    z=A*B;
    if(x>y && x>z){
        printf("%d\n",x);
    }
    else if(y>z){
        printf("%d\n",y);
    }
    else{
        printf("%d\n",z);
    }
    return 0;
}
