import sys

def main():
    input = sys.stdin.read().split()
    idx = 0
    k = int(input[idx])
    idx += 1
    factors = []
    for _ in range(k):
        p = int(input[idx])
        e = int(input[idx+1])
        factors.append((p, e))
        idx += 2

    # Compute N as the product of p^e
    N = 1
    for p, e in factors:
        N *= p ** e

    for p, e in factors:
        if e != 1:
            continue
        M = N // p
        if M == 1:
            print(p, 1)
            return
        if 2 * M == p - 1:
            print(p, 2)
            return

    print(-1, -1)

if __name__ == '__main__':
    main()