N,M=map(int,input().split())
A=[list(map(int,input().split())) for i in range(N)]
P=10**18
for x in range(4):
  for y in range(1<<N):
    C=bin(x).count('1')+bin(y).count('1')
    C=M-C
    if C>N:
      continue
    B=[A[i][:] for i in range(N)]
    Q=0
    if x&1:
      for j in range(N):
        Q+=B[j][j]
        B[j][j]=0
    if x&2:
      for j in range(N):
        Q+=B[j][N-1-j]
        B[j][N-1-j]=0
    for i in range(N):
      if y&(1<<i):
        for j in range(N):
          Q+=B[j][i]
          B[j][i]=0
    z=sorted([sum(B[i]) for i in range(N)])
    for i in range(C):
      Q+=z[i]
    P=min(Q,P)
print(P)