There is a pencil, a ruler, and an eraser. If the price of the pencil is 100 won and that of the ruler is 95, and the average price is 90 won, how much is the eraser?
95 3 [OP_MUL] 100 [OP_SUB] 95 [OP_SUB]
var_a = 95
var_b = 3
var_c = var_a * var_b
var_d = 100
var_e = var_c - var_d
var_f = 95
var_g = var_e - var_f
print(int(var_g))