Below is an instruction that describes a task. Write a response that appropriately completes the request in French. Please answer in French.

### Instruction:
 Lionel walked 4 miles. Esther walked 975 yards and Niklaus walked 1287 feet. How many combined feet did the friends walk?


### Response:
 Lionel a marché 4 miles = 4 * 5280 pieds = <<4*5280=21120>>21,120 pieds.
Esther a marché 975 yards = 975 * 3 pieds = <<975*3=2925>>2,925 pieds.
Niklaus a marché 1287 pieds = <<1287>>1,287 pieds.
Le nombre total de pieds parcourus par les amis est de 21,120 + 2,925 + 1,287 = <<21120+2925+1287=25332>>25,332 pieds.