// A Number is a 64-bit float: every integer is exact only up to 2 ** 53.
const asNumber = 2 ** 64 - 1;

// A BigInt is exact at any size. Every literal needs the n suffix.
function minimumMoves(n) {
  return 2n ** BigInt(n) - 1n;
}

console.log(`Number: ${asNumber}`);
console.log(`BigInt: ${minimumMoves(64)}`);