3 "△" and 1 "◇" are balanced with 10 "*", and 1 "△" is balanced with 1 "◇" and 2 "*", so how many "*" are balanced with 1 "◇" balance.
3个"△"和1个"◇"与10个"*"平衡，1个"△"与1个"◇"和2个"*"平衡，那么多少个"*"与1个"◇"平衡．
<result>1</result>