#!/usr/bin/env python3
import sys
data = [[int(n.rstrip()) for n in l.split('\t')] for l in sys.stdin]

maxnum, minnum = [max(l) for l in data], [min(l) for l in data]
diff = [maxnum[n] - minnum[n] for n in range(len(maxnum))]
print(sum(diff))