Students are sitting on the playground. Yujeong is seated in the 12th row from the left, 11th row from the right, 18th row from the front, and 8th row from the back. How many students are sitting on the playground, assuming the same number of students are in each row?
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))