def calculate_triangle_area(x1, y1, x2, y2, x3, y3):
    area = 0.5 * abs(x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2))
    return area


ret = 0
for _ in range(int(input())):
    x1, y1, x2, y2, x3, y3 = map(int, input().split())
    area = calculate_triangle_area(x1, y1, x2, y2, x3, y3)
    area1 = calculate_triangle_area(0, 0, x2, y2, x3, y3)
    area2 = calculate_triangle_area(x1, y1, 0, 0, x3, y3)
    area3 = calculate_triangle_area(x1, y1, x2, y2, 0, 0)
    
    if area == area1 + area2 + area3:
        ret += 1
        
print(ret)