Simple Array Sum Javascript

HackerRank.com Simple Array Sum Javascript

 var sum = 0;  
 function processData(input) {  
   var lines = input.split("\n");  
   var n = parseInt(lines[0]);  
   var arr = lines[1].split(" ");  
   for (var i = 0; i < input.length; i++) {  
     sum += parseInt(arr[i]);  
   }  
   console.log(sum);  
 }   
   
 process.stdin.resume();  
 process.stdin.setEncoding("ascii");  
 _input = "";  
 process.stdin.on("data", function (input) {  
   _input += input;  
 });  
   
 process.stdin.on("end", function () {  
   processData(_input);  
 });