import sys
input = sys.stdin.readline

N,M=map(int,input().split())
A=[]
for i in range(N):
    A.extend(list(map(int,input().split())))

ANS=1<<30
for i in range(1<<(N+2)):
    
    x=0
    for j in range(N+2):
        if (1<<j) & i !=0:
            x+=1

    r=M-x

    if r<0 or r>N:
        continue

    SCORE=0
    C=[]

    for j in range(N):
        sc=0
        for k in range(N):
            if (1<<k) & i != 0:
                SCORE+=A[k*N+j]
            elif j==k and (1<<N) & i !=0:
                SCORE+=A[k*N+j]
            elif j==N-k-1 and (1<<(N+1)) & i !=0:
                SCORE+=A[k*N+j]
            else:
                sc+=A[k*N+j]
        C.append(sc)

    ANS=min(ANS,SCORE+sum(sorted(C[:r])))

print(ANS)