Xiaoyu took 1 5-yuan, 3 2-yuan, and 4 1-yuan renminbi to the supermarket to buy things, and he spent a total of 11 yuan. How many different payment methods does he have.
小雨拿1张5元、3张2元、4张1元的人民币到超市买东西，他共花费了11元．他有多少种不同的付款方式．
<result>3</result>