According to the song by The Proclaimers, how many miles in total would the singer walk to "fall down at your door"?

"I'm Gonna Be (500 Miles)" is a song written and performed by Scottish duo The Proclaimers, and first released as the lead single from their 1988 album Sunshine on Leith. The song reached number 11 in the UK Singles Chart on its initial release, and it has since become their most popular song worldwide, initially becoming a number 1 hit in Iceland, before reaching number 1 in both Australia and New Zealand in early 1989.

In 1993, following its appearance in the American film Benny & Joon, the song was released in North America and many other countries around the world, it reached the top five on both the US Billboard Hot 100 and Canadian Hot 100 charts. In 2007 the Proclaimers re-recorded the song with English comedians Peter Kay and Matt Lucas for the UK's Comic Relief charity telethon, scoring a number one hit in the UK, outperforming their original UK singles performance.

The songs chorus is:

But I would walk five hundred miles

And I would walk five hundred more

Just to be the man who walks a thousand miles

To fall down at your door