VTMO 2026 - Grade 2 - Final - SET 3 - Self-study Question 2

A shop sells pencils at the prices shown: 1 pencil for 3,000 VND, 2 for 5,000 VND, or 5 for 9,000 VND. Pi has 44,000 VND. What is the greatest number of pencils Pi can buy? Purchases of different sizes may be combined.