There are 30 trees along the straight road. If the distance between every tree is 3 meters (m), what is the distance between the first and the last trees?
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))