Uncle Wang participates in rural cooperative medical insurance in our county. The clause stipulates: a deductible line is set for farmers' hospitalization medical expenses, and the county-level medical institutions pay 400 yuan, and the part above the deductible line is compensated at 45%. In April this year, Uncle Wang suffered from acute enteritis and was hospitalized in a designated hospital for 20 days. The medical expenses totaled 8,260 yuan. According to the terms and conditions, how much does Uncle Wang only need to pay?
王大伯参加我县农村合作医疗保险．条款规定：农民住院医疗费设起付线，县级医疗机构为400元，在起付线以上的部分按45%补偿．今年4月份王大伯患了急性肠炎，在定点医院住院治疗了20天，医疗费用共计8260元．按条款规定，王大伯只要自付多少元？
<gadget id="calculator">8_260 - 400</gadget>
<output>7_860</output>

<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">7_860 * (9/20)</gadget>
<output>3_537</output>

<gadget id="calculator">8_260 - 3_537</gadget>
<output>4_723</output>

<result>4_723</result>