'use strict';

function main(input) {
  const args = input.split(' ');

  const a = parseInt(args[0], 10);
  const b = parseInt(args[1], 10);

  const add = a + b;
  const sub = a - b;
  const mul = a * b;
  let max = 0;

  if(add > sub  && add > mul){
    max = add;
  }else if(sub > add && sub > mul){
    max = sub;
  }else if(mul > add && mul > sub)
  {
    max = mul;
  }
  console.log(parseInt(max));
}

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