import random
import math
import statistics

lista3=[]
#kol=range(10000)
#print(random.choice(range(1000))

for i in range(9999):
    dane1=(random.choice(range(10000)),random.choice(range(10000)))
    dane1=list(dane1)
    #print(dane1)

    dane2=(random.choice(range(10000)),random.choice(range(10000)))
    dane2=list(dane2)
    #print(dane2)


    b=int(dane1[0])-int(dane2[0])
    a=int(dane1[1])-int(dane2[1])
    c=a**2+b**2
    c=math.sqrt(c)
    lista3.append(c)
    #print(c)


statistics.mean(lista3)
print(statistics.mean(lista3)/10000)