# Hint: Push
This exercise teaches you how values are pushed onto the stack.
## Pushing Values
In Seq, writing a value pushes it onto the stack. To push multiple values, just write them one after another:
```seq
1 # Stack: ( 1 )
1 2 # Stack: ( 1 2 )
1 2 3 # Stack: ( 1 2 3 )
```
## Stack Notation
Stack effects are written as `( before -- after )`.
The leftmost value is at the bottom, rightmost is on top:
- `( 1 2 3 )` means 1 is at the bottom, 3 is on top
## The Solution
Replace `0 0 0` with `1 2 3`.
When the test runs, it checks:
1. Pop top, should be 3
2. Pop next, should be 2
3. Pop next, should be 1