import sys

sys.setrecursionlimit(200005)
# sys.set_int_max_str_digits(200005)
int1 = lambda x: int(x)-1
pDB = lambda *x: print(*x, end="\n", file=sys.stderr)
p2D = lambda x: print(*x, sep="\n", end="\n\n", file=sys.stderr)
def II(): return int(sys.stdin.readline())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def LI1(): return list(map(int1, sys.stdin.readline().split()))
def LLI1(rows_number): return [LI1() for _ in range(rows_number)]
def SI(): return sys.stdin.readline().rstrip()

dij = [(0, 1), (-1, 0), (0, -1), (1, 0)]
# dij = [(0, 1), (-1, 0), (0, -1), (1, 0), (1, 1), (1, -1), (-1, 1), (-1, -1)]
# inf = -1-(-1 << 31)
inf = -1-(-1 << 62)

# md = 10**9+7
md = 998244353

from collections import deque

h,w,k=LI()
aa=LLI(h)

def binary_search(l, r, minimize):
    if minimize: l -= 1
    else: r += 1
    while l+1 < r:
        m = (l+r)//2
        if ok(m) ^ minimize: l = m
        else: r = m
    if minimize: return r
    return l

def ok(m):
    q=deque()
    dist=[[inf]*w for _ in range(h)]
    dist[0][0]=aa[0][0]<m
    q.append((0,0))
    while q:
        i,j=q.popleft()
        d=dist[i][j]
        for di, dj in dij:
            ni, nj = i+di, j+dj
            if ni < 0 or nj < 0 or ni >= h or nj >= w: continue
            if aa[ni][nj]>=m:
                if d<dist[ni][nj]:
                    dist[ni][nj]=d
                    q.appendleft((ni,nj))
            else:
                if d+1<dist[ni][nj]:
                    dist[ni][nj]=d+1
                    q.append((ni,nj))
    return dist[-1][-1]<=k

ans=binary_search(0,10**9,False)
print(ans)