The serialize_word library function abstracts the need to work directly with the output pointer (see the felt* passed into the main function, it permits accessing segments of memory to output for use/need by the verifier)
All you need to do is pass 400 to the serialize_word function and the main will in turn output 400.  

Can you help how to change the code so that it outputs 400 as well?

```
// The following code outputs the numbers 100, 200, 300.
// 1. Click on "Run" to see the output.
// 2. Change it to output 400 as well.

// Use the output builtin.
%builtins output

// Import the serialize_word() function.
from starkware.cairo.common.serialize import serialize_word

func main{output_ptr: felt*}() {
// Output 100 by calling serialize_word.
serialize_word(100);
// Output 200.
serialize_word(200);
// Output 300.
serialize_word(300);
// Return.
return ();
}
```

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