def render_coeff(width,hight,time):
        return float(time/(width*hight))
def render_time(width,hight,coeff):
        return float((width*hight)*coeff)

ri = input("enter rendered image width, hight, time: ")
l = ri.split(',')
coeff = render_coeff(int(l[0]),int(l[1]),int(l[2]))

ri2 = input("enter width and hight for final image")
l2 = ri2.split(',')
print("rendertime for this image is ", render_time(int(l2[0]), int(l2[1]), coeff), " seconds")