bounce.steven.ver

const getGets = arr => {
  let index = 0;

  return () => {
    const toReturn = arr[index];
    index += 1;
    return toReturn;
  };
};
// this is the test
const test = ["3 4"];

const gets = this.gets || getGets(test);
const print = this.print || console.log;

const [row, col] = gets()
  .split(" ")
  .map(Number);

let r = 0;
let c = 0;

let ir = 1;
let ic = 1;

let sum = 1;

while (
  !(
    (!r && c === col - 1) ||
    (r === row - 1 && !c) ||
    (r === row - 1 && c === col - 1)
  )
) {
  r += ir;
  c += ic;
  if (r === row - 1) ir = -1;
  if (c === col - 1) ic = -1;
  if (!r) ir = 1;
  if (!c) ic = 1;
  sum = bigInt(2).pow(r+c).add(sum);
}

print(sum.toString());