from math import gcd

a = int(input())
b = int(input())
c = int(input())

deno = (b - a) * (c - a)
t1 = (a * b) * (c - a)
t2 = (a * c) * (b - a)
nume = t1 * t2 // gcd(t1, t2)
g = gcd(deno, nume)
print(nume // g, deno // g, sep="/")