Ten ginkgo trees are planted on one side of the playground at intervals of 10 meters (m). If ginkgo trees are planted at both the beginning and the end, find the length in meters (m) of this field.
10 1 [OP_SUB] 10 [OP_MUL]
var_a = 10
var_b = 1
var_c = var_a - var_b
var_d = 10
var_e = var_c * var_d
print(int(var_e))