document.write('
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  1. let print = this.print || console.log;
  2. let gets = this.gets || ((arr, index) => () => arr[index++])(input, 0);
  3.  
  4.  
  5. let n = gets();
  6. let firstNumber = n.substring(0, 1);
  7. let secondNumber = n.substring(1, 2);
  8. let thirdNumber = n.substring(2, 3);
  9. let fourthNumber =  n.substring(3);
  10.  
  11. let sum = (+firstNumber) + (+secondNumber) + (+thirdNumber) + (+fourthNumber);
  12.  
  13. print(sum);
');