def find_max(num_1, num_2):
max_val = 0.0
if (num_1 > num_2): # if num1 is greater than num2,
max_val = num_1 # then num1 is the maxVal.
else: # Otherwise,
max_val = num_2 # num2 is the maxVal
return max_val
num_a = 5.0
num_b = 10.0
num_y = 3.0
num_z = 7.0
max_sum = 0.0
max_sum = find_max(num_a,num_b)+find_max(num_y,num_z)
print('max_sum is:', max_sum)