Managing editor Biljana Zlatanovska Ph.D. Editor in chief Zoran Zdravev Ph.D. Lectoure Snezana Kirova Technical editor Slave Dimitrov Address of the editorial offce Goce Delcev University – Stip Faculty of philology Krste Misirkov 10-A PO box 201, 2000 Štip, Republic of North Macedonia AIMS AND SCOPE: BJAMI publishes original research articles in the areas of applied mathematics and informatics. Topics: 1. Computer science; 2. Computer and software engineering; 3. Information technology; 4. Computer security; 5. Electrical engineering; 6. Telecommunication; 7. Mathematics and its applications; 8. Articles of interdisciplinary of computer and information sciences with education, economics, environmental, health, and engineering. BALKAN JOURNAL OF APPLIED MATHEMATICS AND INFORMATICS (BJAMI), Vol 3 ISSN 2545-4803 on line Vol. 3, No. 1, Year 2020