user: Question: What is the greatest number of valves?
Columns: ['Displacement', 'Bore', 'Stroke', 'Cylinders', 'Valves', 'Power', 'Torque', 'Applications']
Types: ['text', 'text', 'text', 'text', 'real', 'text', 'text', 'text']
Sample row: ['cc (L; cu in)', '88.0mm', '88.4mm', 'straight-4', 16.0, 'PS (kW; hp) @4200 rpm', 'N·m (lb·ft) @1500 rpm', '1998 W202 C-Class , 1998 W210 E-Class']
SQL:

assistant: SELECT MAX("Valves") FROM "Table";