Please answer the following question: Given the following passage  "According to Chinese state officials, the quake caused 69,180 known deaths including 68,636 in Sichuan province; 18,498 people are listed as missing, and 374,176 injured, but these figures may further increase as more reports come in.[dated info] This estimate includes 158 earthquake relief workers who were killed in landslides as they tried to repair roads.",  answer the following question. Note that the answer is present within the text.  Question: How many helpers died?
Answer:
158