n,m=map(int,input().split())
cnt=[0]*m
a=[]
for i in range(n):
  b=list(map(int,input().split()))
  a.append(b)
  for j in range(m):
    cnt[j]+=b[j]
c=[]
for i in range(n):
  tmp=0
  for j in range(m):
    tmp+=cnt[j]*a[i][j]
  c.append(tmp)
c.sort()
print(sum(c[1::2])-sum(c[::2]))