N, M, K = map(int, input().split())
a = [list(map(int, input().split())) for _ in range(N)]
dp = [-1]*K + [0]

for i in range(N):
    for y in range(1, K+1):
        if dp[y] == -1:
            continue
        for j in range(M):
            if a[i][j] <= y:
                dp[y - a[i][j]] = max(dp[y - a[i][j]], dp[y]+1)

for i, v in enumerate(dp):
    if v == N:
        print(i)
        break
else:
    print(-1)