import random
n=0
N=100000
b=0
for i in range(N):
    a=[["Решка","Орел"]]*99 + [["Орел","Орел"]]
    b=random.choice(a)
    c=random.choice(b)
    if c== "Орел":
        N+=1
        b.remove(c)
        if b[0]=="Орел":
            n+=1
print(n/N)