n = int(input('Valeur de n : '))
p = float(input('Valeur de p :' ))
i = 0
c = binom(n,p,0)

while c <= 0.025:
    i += 1
    c += binom(n,p,i)

a = i

while c < 0.975:
    i += 1
    c += binom(n,p,i)

b = i

print('[',a/n,';',b/n,']')