from turtle import*
def vodik(x,y):
    pu()
    setpos(x,y)
    pd()
    fillcolor('white')
    begin_fill()
    circle(40)
    end_fill()
    return
def ugljik(x,y):
    pu()
    setpos(x,y)
    pd()
    fillcolor('grey')
    begin_fill()
    circle(60)
    end_fill()
def metan(x,y):
    ugljik(x,y)
    vodik(x-90,y+20)
    vodik(x+90,y+20)
    vodik(0,y-70)
    vodik(0,y+110)
    return
metan(0,0)
ht()