function main(input) {
  input=input.trim();
  const x = parseInt(input.split(" ")[0], 10);
  const a = parseInt(input.split(" ")[1], 10);
  const b = parseInt(input.split(" ")[2], 10);

  console.log(Math.min.apply(null, [Math.abs(x-a),Math.abs(x-b)]));
}

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