import sys
readline = sys.stdin.readline
N, M, K = map(int, readline().split())
dp = 1

for _ in range(N):
    res = 0
    A = tuple(map(int, readline().split()))
    for a in A:
        res |= (dp << a)
    dp = res

dp &= (1<<(K+1)) - 1
ans = 0
if not dp:
    ans = -1
else:
    ans = K - dp.bit_length() + 1

print(ans)