import sys


def input(): return sys.stdin.readline().rstrip('\n')


def main():
    n, m, k = map(int, input().split())
    ans = {0}
    for _ in range(n):
        *a, = map(int, input().split())
        ans = set(i + j for i in a for j in ans)
    ans = [i for i in ans if i <= k]
    if not ans:
        return -1
    return k - max(ans)


if __name__ == '__main__':
    ret = main()
    if ret is not None:
        print(ret)