#!/usr/bin/env python3

import math

output = []
for x in range(-70, 71):
    f = x/10
    T = 2
    if f == 0:
        sinc = 1
    else:
        sinc = ((math.sin(math.pi * f * T)) / (math.pi * f * T)) ** 2
    s = (T**2) * (sinc**2)
    output.append(str((f, s)))

print(" --\n".join(output))