#!/usr/bin/python3 if __name__ == '__main__': with open('input.txt', 'r') as input_file: l1 = [] l2 = [] for line in input_file: l1.append(int(line.split()[0])) l2.append(int(line.split()[1])) l1 = sorted(l1) l2 = sorted(l2) total = 0 for i in range(len(l1)): total += abs(l1[i] - l2[i]) print(total)