J_tkinter

import tkinter as tk

w, h = 700, 400

# n, k = map(int, input().split())
def start():
    draw.delete('all')
    n = int(n_entry.get())
    k = int(k_entry.get())

    if k > (n-1)*n:
        draw.create_text(350, 200, text="impossible")
        return

    x, y = 0, 0
    r = n*2
    hit = 0
    for i in range(n):
        if hit + 2*i > k:
            break
        hit += 2*i
    diff = k - hit
    stopindex = i + ((n-1)*n == hit)
    xplus = r * 2 + 1 - diff

    def coords(x, y, rad):
        mag = w/n/15
        x, y = x+r, y+r
        x, y, rad = x*mag, y*mag, rad*mag
        return (x-rad, y-rad, x+rad, y+rad)

    for i in range(stopindex):
        print(x, y, r)
        draw.create_oval(coords(x, y, r))
        x += 2

    x += xplus - 2
    if stopindex != n:
        print(x, y, r)
        draw.create_oval(coords(x, y, r))
    x += r+2
    for _ in range(stopindex+1, n):
        print(x, y, 1)
        draw.create_oval(coords(x, y, 1))
        x += 3
    print()

window = tk.Tk()
n_entry = tk.Entry(window)
n_entry.pack()
k_entry = tk.Entry(window)
k_entry.pack()
start_button = tk.Button(window, text="Get it!", command=start)
start_button.pack()
draw = tk.Canvas(window, background='white', width=700, height=400)
draw.pack()

window.mainloop()