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

def gcd(a, b):
    if b == 0:
        return a
    return gcd(b, a % b)

def lcm(a, b):
    return (a * b) / gcd(a, b)
    
m = lcm(t1, lcm(t3, t2))

print('%d/1' % m)