import sys
input = sys.stdin.buffer.readline
sys.setrecursionlimit(10 ** 7)
inf = 10**9

N, M, K = map(int, input().split())
A = tuple(tuple(map(int, input().split())) for _ in range(N))

dp = set([0])
for a in A:
    newDP = set()
    for x in a:
        for y in dp:
            newDP.add(x + y)
    dp = newDP

ans = inf
for x in dp:
    if x > K:
        continue
    ans = min(ans, K - x)

if ans >= inf:
    ans = -1
print(ans)