12. Equal Pairs

n = int(input())

sum = 0
diff = 0

for number in range(0, n):
    num_1 = int(input())
    num_2 = int(input())
    if number > 0:
        diff = abs(sum - (num_1 + num_2))
    sum = num_1 + num_2

if diff == 0:
    print(f'Yes, value={sum}')
elif not diff == 0:
    print(f'No, maxdiff={diff}')