You want to draw points at intervals of 5 centimeters (cm) on a line that is 30 centimeters (cm) long. How many times should a dot be drawn when there is no dot at the beginning and end of a line?
30 5 [OP_DIV] 1 [OP_SUB]
var_a = 30
var_b = 5
var_c = var_a / var_b
var_d = 1
var_e = var_c - var_d
print(int(var_e))