When there are 57 boys and 82 girls on the playground, the number of female students is 13 more than male students plus teachers. How many teachers are there in the playground?
82 13 [OP_SUB] 57 [OP_SUB]
var_a = 82
var_b = 13
var_c = var_a - var_b
var_d = 57
var_e = var_c - var_d
print(int(var_e))