If the circumference of a rectangular book is 100 centimeters (cm) and the width is 20 centimeters (cm) when viewed from the front, what is the length of this book?
100 2 [OP_DIV] 20 [OP_SUB]
var_a = 100
var_b = 2
var_c = var_a / var_b
var_d = 20
var_e = var_c - var_d
print(int(var_e))