function main(input) {
    const args = input.split(' ');
    const a = parseInt(args[0], 10);
    const b = parseInt(args[1], 10);
  
  const sum = a + b
  const sub = a - b
  const mul = a * b
  
  let result = sum

    if (result < sub) 
        result = sub
  
  if ( result < mul )
    result = mul
  
       console.log(result);
}

main(require('fs').readFileSync('/dev/stdin', 'utf8'));