text: const fs = require('fs');
  
  const input = fs.readFileSync('./input.txt', { encoding:'utf8' });
  const data = input.trim().split(/\r?\n/);
  const sum = 2020;
  
  let tempObj = {};
  
  for (const el of data) {
    let temp = sum - el;
  	 
    if (Object.prototype.hasOwnProperty.call(tempObj, temp)) {
      console.log(el * temp);
      break;
    }
  
    tempObj[el] = 1;
  }
  