I am not sure how to implement this in less, not sure where to start. 

The purpose is to increment the padding by a variable(15px in this example) to a depth (increment variable). Is this possible in less?

```
ul {
  li{
    padding-left: 30px;
  }
  ul {
    li{
      padding-left: 45px;
    }
    ul {
      li{
        padding-left: 60px;
      }
      ul {
        li{
          padding-left: 75px;
        }
        ul {
          li{
            padding-left: 90px;
          }
        }
      }
    }
  }
}

```