TypeError: integer argument expected, got float line 35

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import cv2
import numpy as np

img = cv2.imread('Bluelinegap50blur.jpg')
gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
edges = cv2.Canny(img, 50, 200)

# find lines
rho = 1
theta = np.pi / 180
threshold = 10
min_line_length = 0
max_line_gap = 10
line_image = np.copy(edges) * 0
lines = cv2.HoughLinesP(edges, rho, theta, threshold, np.array([]),
                    min_line_length, max_line_gap)
# draw found lines        
img_dst = cv2.cvtColor(gray,cv2.COLOR_GRAY2RGB)
for line in lines[0]:
    cv2.line(img_dst, (line[0], line[1]), (line[2], line[3]), (0,255,0), 2)

# find corners
gray = np.float32(gray)
dst = cv2.cornerHarris(gray, 15, 5, 0.04)
# non-maximum suppression via dilation
kernel = np.ones((10,10))
max_dst = cv2.dilate(dst, kernel)   
dst = dst * (dst == max_dst)
# sort points by strength, find their positions and take 5 highest ones
sortIdx = np.argsort(dst.flatten())[::-1][:5]
# draw them
w = img.shape[1]

for idx in sortIdx:
   cv2.circle(img_dst,(idx % w, idx / w) , 3, (0,0,255), -1)