Grandpa Li participated in the rural cooperative medical insurance. The insurance clause stipulates: a minimum payment line is set for the inpatient medical expenses compensation of the insured, 100 yuan for township (town) medical institutions, and 200 yuan for county-level medical institutions. The part above the minimum payment line is compensated at 70%. The money below the line is borne by the inpatient. In June this year, Grandpa Li suffered a fracture due to an accidental injury. He was hospitalized in Jingding Hospital for 30 days, and the medical expenses totaled 6,100 yuan. According to the terms and conditions, how much does Grandpa Li only need to pay?
李爷爷参加了农村合作医疗保险．保险条款规定：参保者住院医疗费补偿设起付线，乡(镇)级医疗机构为100元，县级医疗机构为200元，在起付线以上的部分按70%补偿，在起付线以下的钱由住院者承担．今年6月份李爷爷由于意外伤害造成骨折，在镇定点医院住院治疗了30天，医疗费用共计6100元．按条款规定，李爷爷只需自付多少元？
<gadget id="calculator">6_100 - 100</gadget>
<output>6_000</output>

<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1 - (7/10)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">6_000 * (3/10)</gadget>
<output>1_800</output>

<gadget id="calculator">1_800 + 100</gadget>
<output>1_900</output>

<result>1_900</result>