import math

n = int(input())
radii = list(map(int, input().split()))

prev_r = None
prev_n = 1
prev_d = 1
for r in radii:
    if prev_r is None:
        prev_r = r
        continue

    n = prev_r * prev_n
    d = r * prev_d
    gcd = math.gcd(n, d)
    n = n // gcd
    d = d // gcd
    print(f"{n}/{d}")
    prev_n = n
    prev_d = d
    prev_r = r