import fractions

def gcd(a, b):
    while b:
        a, b = b, a%b
    return a

def lcm(a, b):
    return a*b // gcd(a, b)

def reduce(p, q):
    common = gcd(p, q)
    return (p // common, q // common)

t1 = int(input())
t2 = int(input())
t3 = int(input())

t = lcm(t1, t2)
t = lcm(t, t3)

period = [t//t1, t//t2, t//t3]
period_max = max(period) - 1

while period_max > 0:
    if period[0]%period_max == period[1]%period_max == period[2]%period_max:
        D = period_max
        break

    period_max -= 1

N, D = reduce(t, D)
print(str(N) + "/" + str(D))