5.3

tablica = [[73, 98, 51, 25], [63, 17, 66, 80], [77, 58, 79, 64]]

wynik = 1

for i in range(len(tablica)):
    for j in range(len(tablica[i])):
        if tablica[i][j] % 7 == 0:
            wynik = wynik * tablica[i][j]

print(wynik)