During the Spring Festival, Mu Mu received 5 red packets of 100 yuan and 6 red envelopes of 50 yuan. How many different currency values can these renminbi make up? (without leaflet)
木木过春节时收到的红包共有5张100元和6张50元．这些人民币一共可以组成多少种不同的币值？(不含单张)
<result>15</result>