Thirty flags were planted every 3 meters (m) on the straight track of the playground. Find the total length of the straight track. (However, flags are also planted at the beginning and the end of straight tracks.)
3 30 1 [OP_SUB] [OP_MUL]
var_a = 3
var_b = 30
var_c = 1
var_d = var_b - var_c
var_e = var_a * var_d
print(int(var_e))