5
27468 7465 74275 40573 40155
112071 76270 244461 264202 132397
1 777133331
2 107454154
3 652330694
4 792720519
 5
78188 56310 79021 70050 65217
115040 5149 128449 98357 36580
1 451393770
2 574046602
3 590130784
4 112514248
 7
1 1 1 1 1 1 1
1 3000000000 3000000000 3000000000 1000000000 1000000000 1000000000
1 1000000000
1 1000000000
1 1000000000
1 1000000000
1 1000000000
1 1000000000
 10
2 8 6 1 2 7 6 9 2 8
4 9 4 3 5 2 9 3 7 3
1 8
2 8
3 8
4 10
5 1
6 4
7 3
8 10
9 2
 11
1 1 1 1 1 1 1 1 1 1 1
1 1000000001 1000000001 1000000001 1000000001 1000000001 1000000001 1000000001 1000000001 1000000001 1000000001
1 1000000000
1 1000000000
1 1000000000
1 1000000000
1 1000000000
1 1000000000
1 1000000000
1 1000000000
1 1000000000
1 1000000000
 5
2 1 1 2 3
1 2 2 2 1
1 2
1 3
2 4
1 4

NO
 NO
 NO
 YES
 NO
 NO

from sys import stdin
def main():
    n = int(stdin.readline())
    b = [0] + map(float, stdin.readline().split())
    a = [0] + map(float, stdin.readline().split())
    d = [(0, 0), (0, 1)] + [map(int, stdin.readline().split(), (10, 10)) for _ in xrange(n - 1)]
    r = [0] * (n + 1)
    t = 0
    for i in xrange(n, 0, -1):
        p, k = d[i]
        b[i] += r[i]
        if b[i] >= a[i]:
            v, w = divmod(b[i] - a[i], k)
            r[p] += v
            t += w
        else:
            t += a[i] - b[i]
    if t < r[0] + 1e-9:
        print "YES"
    else:
        print "NO"
main()
