import matplotlib.pyplot


def flat_landscape(size):
    environment = []
    for i in range(size):
        row_list = []
        for j in range(size):
            row_list.append(50)
        environment.append(row_list)
    return environment


def sloping_x_landscape(size):
    environment = []
    for i in range(size):
        row_list = []
        for j in range(size):
            row_list.append(j)
        environment.append(row_list)
    return environment
    
def sloping_both_landscape(size):
    environment = []
    for i in range(size):
        row_list = []
        for j in range(size):
            row_list.append(j + i)
        environment.append(row_list)
    return environment    
    
size = 300
    
landscape =  sloping_both_landscape(size)   
matplotlib.pyplot.imshow(landscape)
matplotlib.pyplot.show()