import sys
import numpy as np

read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

def solve_on_circ(N, A):
    A0 = A
    n = (N + 1) // 2
    m = N - n
    A -= n * (n - 1) // 2 + m * (m - 1) // 2
    assert A >= 0
    x = np.linspace(0, 0.1, n + 1)[::-1]
    dx = 0.1 / (n + n)
    y = []
    phi = 2 * np.arcsin(0.25)
    for i in range(m):
        t = min(n, A)
        A -= t
        y.append(phi + x[t] + dx)
    t = np.concatenate([x[:-1], y])
    x = 20 * np.cos(t)
    y = 20 * np.sin(t)
    return x, y

def other_points(M):
    x = np.linspace(100, 90000, M)
    y = np.zeros_like(x)
    return x, y

def solve(N, A, B):
    left = 0  # B 未満
    right = N  # B以上
    while left + 1 < right:
        x = (left + right) // 2
        if x * (x - 1) // 2 >= B:
            right = x
        else:
            left = x
    n = right
    x0, y0 = other_points(N - n)
    x, y = solve_on_circ(n - 1, A)
    far = n * (n - 1) // 2 - B
    eps = 1e-7
    x[:far] *= (1 + eps)
    y[:far] *= (1 + eps)
    x[far:] *= (1 - eps)
    y[far:] *= (1 - eps)
    x = np.concatenate([[0], x, x0])
    y = np.concatenate([[0], y, y0])
    return x, y

N, A, B = map(int, read().split())

x, y = solve(N, A, B)
xy = np.vstack([x, y]).T
print('\n'.join(' '.join(row) for row in xy.astype(str)))