A kitchen shop sells saucepans in sizes small, medium and large.

- On a given day, 100 people each bought at least one saucepan from the shop.
- 4 people bought all three sizes of saucepan. In total, 29 people bought a small saucepan, of which 13 also bought a medium saucepan. 7 people bought a small saucepan and a large saucepan.
- In total, 68 people bought a medium saucepan, of which 16 also bought a large saucepan.

By drawing a Venn diagram to show the information above, work out the total number of people that bought a large saucepan.