Among the 30 students in Hoseok's class, 12 students came later than Hoseok. How many students came earlier than Hoseok?
30 12 [OP_SUB] 1 [OP_SUB]
var_a = 30
var_b = 12
var_c = var_a - var_b
var_d = 1
var_e = var_c - var_d
print(int(var_e))