Simple Math CPU Pressure

If OBJECT_ID('#SampleMath') Is Not Null
    Drop Table #SampleMath;
Go

Create Table #SampleMath(
    PK bigint identity(1,1))
Go

Insert Into #SampleMath Default Values;
Go 400

Select Sum(log(tS1.PK + tS2.PK)
    + log(tS2.PK + tS3.PK)
    + log(tS3.PK + tS4.PK)
    + log(tS4.PK + tS5.PK)
    + log(tS5.PK + tS1.PK))
From #SampleMath tS1
Cross Join #SampleMath tS2
Cross Join #SampleMath tS3
Cross Join #SampleMath tS4
Cross Join #SampleMath tS5;
Go

Drop Table #SampleMath;
Go