If 1256 students are enrolled in a school, the first graders are 408 fewer than the total of students excluding first year. How many students are in first grade?
1256 408 [OP_SUB] 2 [OP_DIV]
var_a = 1256
var_b = 408
var_c = var_a - var_b
var_d = 2
var_e = var_c / var_d
print(int(var_e))