import math
x1,x2,x3 = map(int,input().split())
min_dist = math.sqrt((x1-x2)**2+(x2-x3)**2+(x3-x1)**2)
print(min_dist)
aW1wb3J0IG1hdGgKeDEseDIseDMgPSBtYXAoaW50LGlucHV0KCkuc3BsaXQoKSkKbWluX2Rpc3QgPSBtYXRoLnNxcnQoKHgxLXgyKSoqMisoeDIteDMpKioyKyh4My14MSkqKjIpCnByaW50KG1pbl9kaXN0KQ==