How many members of National Assembly are required to present a no confidence against a prime minister?

How many members of National Assembly are required to present a no confidence against a prime minister?

وزیراعظم کے خلاف عدم اعتماد پیش کرنے کے لیے قومی اسمبلی کے کتنے ارکان کی ضرورت ہوتی ہے؟
Explanation

Under the Constitution, 68 members (20 per cent of the total members) of the National Assembly can submit a no-confidence resolution against the prime minister.