Here answer is 1
initial value of S = 1
then we have 9P(), 14V(), 6P(), 8V(), 3P(), 2V()
9P() will change S=0 (only one 1 down operation will take place and remaining will be blocked).
similarly, 14V() changes S = 1
6P() changes S= 0
8V() changes S = 1
3P() changes S= 0
2V() changes S = 1 answer