n = int(input())
m = int(input())

matrix = [list(map(int, input().split())) for _ in range(n)]

k = int(input())

product = 1
found = False

for num in matrix[k - 1]:
    if num > 5:
        product *= num
        found = True

if found:
    print(product)
else:
    print("NO")