import java.util.*;

public class Main {
  
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    
		int a = sc.nextInt();
		int b = sc.nextInt();
		
		int add = a + b;
		int diff = a - b;
		int multi = a * b;
		int max = 0;
		
		if (add >= diff) {
			max = add;
		} else {
			max = diff;
		}
		
		if (multi > max) {
			max = multi;
		}
		
		System.out.println(max);
  }
  
} import java.util.*; util.* java public class Main {
  
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    
		int a = sc.nextInt();
		int b = sc.nextInt();
		
		int add = a + b;
		int diff = a - b;
		int multi = a * b;
		int max = 0;
		
		if (add >= diff) {
			max = add;
		} else {
			max = diff;
		}
		
		if (multi > max) {
			max = multi;
		}
		
		System.out.println(max);
  }
  
} Main public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    
		int a = sc.nextInt();
		int b = sc.nextInt();
		
		int add = a + b;
		int diff = a - b;
		int multi = a * b;
		int max = 0;
		
		if (add >= diff) {
			max = add;
		} else {
			max = diff;
		}
		
		if (multi > max) {
			max = multi;
		}
		
		System.out.println(max);
  } main {
    Scanner sc = new Scanner(System.in);
    
		int a = sc.nextInt();
		int b = sc.nextInt();
		
		int add = a + b;
		int diff = a - b;
		int multi = a * b;
		int max = 0;
		
		if (add >= diff) {
			max = add;
		} else {
			max = diff;
		}
		
		if (multi > max) {
			max = multi;
		}
		
		System.out.println(max);
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int a = sc.nextInt(); a sc.nextInt() sc.nextInt sc int b = sc.nextInt(); b sc.nextInt() sc.nextInt sc int add = a + b; add a + b a b int diff = a - b; diff a - b a b int multi = a * b; multi a * b a b int max = 0; max 0 if (add >= diff) {
			max = add;
		} else {
			max = diff;
		} add >= diff add diff {
			max = add;
		} max = add max add {
			max = diff;
		} max = diff max diff if (multi > max) {
			max = multi;
		} multi > max multi max {
			max = multi;
		} max = multi max multi System.out.println(max) System.out.println System.out System System.out max String[] args args public class Main {
  
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    
		int a = sc.nextInt();
		int b = sc.nextInt();
		
		int add = a + b;
		int diff = a - b;
		int multi = a * b;
		int max = 0;
		
		if (add >= diff) {
			max = add;
		} else {
			max = diff;
		}
		
		if (multi > max) {
			max = multi;
		}
		
		System.out.println(max);
  }
  
} public class Main {
  
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    
		int a = sc.nextInt();
		int b = sc.nextInt();
		
		int add = a + b;
		int diff = a - b;
		int multi = a * b;
		int max = 0;
		
		if (add >= diff) {
			max = add;
		} else {
			max = diff;
		}
		
		if (multi > max) {
			max = multi;
		}
		
		System.out.println(max);
  }
  
} Main
import java.util.*;

public class Main {
  
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    
		int a = sc.nextInt();
		int b = sc.nextInt();
		
		int add = a + b;
		int diff = a - b;
		int multi = a * b;
		int max = 0;
		
		if (add >= diff) {
			max = add;
		} else {
			max = diff;
		}
		
		if (multi > max) {
			max = multi;
		}
		
		System.out.println(max);
  }
  
}