Students sit in groups of seven, and there are nine groups in each class. If there are 13 classes in this school, how many students are there?
13 9 [OP_MUL] 7 [OP_MUL]
var_a = 13
var_b = 9
var_c = var_a * var_b
var_d = 7
var_e = var_c * var_d
print(int(var_e))