Table:
text: Sample return mission
List of missions
Robotic missions
Launch_date Operator_ Name_ Sample_origin Samples_returned Recovery_date Mission_result_
June 14, 1969  Luna E-8-5 No.402 The Moon None - Failure , Launch failure
July 13, 1969  Luna 15 The Moon None - Failure , Crash-landed on the Moon
23 September 1969  Cosmos 300 The Moon None - Failure , Failed to leave Earth orbit
22 October 1969  Cosmos 305 The Moon None - Failure , Failed to leave Earth orbit
6 February 1970  Luna E-8-5 No.405 The Moon None - Failure , Launch failure
September 12, 1970  Luna 16 The Moon 101 grams (3.6 oz) , of lunar rock September 24, 1970 Success

Question: How many mission bugs for the Kosmos 305 are there from the example return mission?