Build rucksack cryptosystem using 5 secrets (m1, m2, m3, m4, m5)

Build rucksack cryptosystem using 5 secrets (m1, m2, m3, m4, m5) for encryption the message of five numbers with thebase of 7∗(c1, c2, c3, c4, c5). At the same time, all these numbers must be ciphered into one number. (10 points)

*the base of 7 means can be used only numbers from 0 to 6. As, for instance, it is with binary numbers: we can use only 0 and 1.