Three food reviewers U, V and W approved cafes located in three zones: North, Central and South. The bar chart gives, for each reviewer and each zone, the exact number of cafes that reviewer approved in that zone (complete data). The following additional facts are known. 1. 34 cafes in all were approved by at least one of U, V and W. 2. Exactly one cafe was approved by all three reviewers, and it was in the South zone. 3. Exactly one cafe was approved by both U and W but not V, and it was in the North zone. 4. Exactly one cafe outside the North zone was approved by both U and V but not W, and it was in the Central zone.
How many cafes in the South zone were approved by at least one reviewer?