#!/usr/bin/env node

const list1=[];
const list2=[];

require('fs').readFileSync('input.txt','utf8').split('\n').filter(i=>i).forEach(line=>{
 const parts = line.split('   ').map(i=>parseInt(i));
 list1.push(parts[0]);
 list2.push(parts[1]);
});

list1.sort((a,b)=>a-b);
list2.sort((a,b)=>a-b);

var dist=0;
for(let idx in list1) {
 dist+=Math.abs(list1[idx]-list2[idx]);
}

console.log('Result:',dist);