How many students are there in Grade One of Siyuan School in Longhui County?

Zhijin Siyuan Experimental School is a fully inclusive and fully enclosed nine-year compulsory education school. So the school charges are like this: because it is public, there is no tuition, and only the living expenses of students during their school days are collected by the school. The living expenses for one semester are: 1500 yuan/student. At the end of the semester, the poor students will enjoy the state subsidy for boarders, 500 yuan, a primary school student, and 625 yuan for a junior high school student.