import sys
input = sys.stdin.buffer.readline
sys.setrecursionlimit(10 ** 7)
mod = 10 ** 9 + 7


def F(p, e):
    n = e + 1
    res = (pow(p, e + 1, mod) - 1) * pow(p - 1, mod - 2, mod) % mod
    res = p * res - e - 1
    res = res * pow(p - 1, mod - 2, mod) % mod
    return res


ans = 1
L = int(input())
for _ in range(L):
    p, e = map(int, input().split())
    ans = ans * F(p, e) % mod

print(ans)