from math import sin,pi

N=60
i=0
a=-1.0
b=20.0
eps=10**(-10)

def f(x):
    return sin(x)

m=(a+b)/2.0
abserr=(b-a)/2.0
print i,m,abserr/abs(m)
while i<=N and abserr>eps*abs(m):
    if f(m)==0:
        a=b=m
    if f(a)*f(m)<0:
        b=m
    else:
        a=m
    i=i+1
    m=(a+b)/2.0
    abserr=(b-a)/2.0
    print i,m,(m-4*pi)/(4*pi)