On the second day, Arvin ran 2 + 1 = <<2+1=3>>3 kilometers.
On the third day, he ran 3 + 1 = <<3+1=4>>4 kilometers.
On the fourth day, he ran 4 + 1 = <<4+1=5>>5 kilometers.
So on the fifth day, he ran 5 + 1 = <<5+1=6>>6 kilometers.
#### 6