Among the students sitting on the playground, Yujeong is 12th from the right, 11th from the left, 18th from the back, and 8th from the front. If the number of students in each row is the same, how many students are sitting on the playground?
12 11 [OP_ADD] 1 [OP_SUB] 18 8 [OP_ADD] 1 [OP_SUB] [OP_MUL]
var_a = 12
var_b = 11
var_c = var_a + var_b
var_d = 1
var_e = var_c - var_d
var_f = 18
var_g = 8
var_h = var_f + var_g
var_i = 1
var_j = var_h - var_i
var_k = var_e * var_j
print(int(var_k))