n = int(input())
total = 0
AB = []
for i in range(n):
    a, b = map(int, input().split())
    AB.append((a, b))
    total += a
AB.sort(key=lambda x:(-x[1], -x[0]))
for a, b in AB:
    if b < total-a:
        print('NO')
        exit()
    total -= a
print('YES')