number = int(input())

total_left = 0
total_right = 0
for i in range(1, number + 1):
    num1 = int(input())
    num2 = int(input())
    if i == 1:
        total_left = num1 + num2
    if i == 2:
        total_right = num1 + num2

if total_left == total_right:
    print(f"Yes, sum = {total_left}")
else:
    difference = abs(total_left - total_right)
    print(f"No, diff = {difference}")