import java.io.BufferedReader;
import java.io.InputStreamReader;

class Main {
  public static void main(String[] args) throws Exception {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    String[] l = br.readLine().split(" ");
    int a = Integer.valueOf(l[0]);
    int b = Integer.valueOf(l[1]);
    
    int add = a + b;
    int sub = a - b;
    int multi = a * b;
    
    int ret = add;
    if (ret < sub) {
      ret = sub;
    }
    if (ret < multi) {
      ret = multi;
    }
    System.out.printf("%d\n", ret);
  }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz