If the number of meters that Xiao Ming walks eastward on the playground is recorded as a positive number, and the number of meters walked westward is recorded as a negative number, his walking trajectory is recorded as follows: +3, -5, +7, -8. So how many meters is Xiao Ming from the origin at this time?
如果把小明在操场上向东走的米数记为正数，向西走的米数记为负数，他步行的轨迹记录如下：+3，-5，+7，-8．那么小明此时距原点有多少米．
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