For all practical purposes, five.
If we are being practical , then lets not gloss over the practicality of that first (10foot) step!
Of course, the mathematician would say the number of steps is not important, the question is how long it will take you to get there. Provided each successive step is taken twice as quickly as the last you should get there in a reasonable time!
The real answer of course is "I though I would just wait here until they came over" - moving from feet to metres is not the only change!