N,M,K = map(int,input().split())
A = []
for _ in range(N):
    a = list(map(int,input().split()))
    a.sort()
    A.append(a)
ans = 0
def perm(n,s):
    global ans
    if n == N:
        ans = max(ans,s)
        return
    for a in A[n]:
        if s+a > K:
            return
        perm(n+1,s+a)

perm(0,0)
if ans == 0:
    print(-1)
else:
    print(K-ans)