from math import gcd

t1 = int(input())
t2 = int(input())
t3 = int(input())
LCM12 = t1 * t2 // gcd(t1, t2)
LCM123 = LCM12 * t3 // gcd(LCM12, t3)
n1 = LCM123//t1
n2 = LCM123//t2
n3 = LCM123//t3

d = 1
for i in range(2, t3 + 1):
    if n1 % i == n2 % i == n3 % i:
        d = i
p = gcd(LCM123, d)
print('{}/{}'.format(LCM123//p, d//p))