#!/usr/bin/python3
from fractions import gcd, Fraction
from functools import reduce
lcm = lambda a, b: a * b // gcd(a, b)
lcmx = lambda *arr: reduce(lcm, arr)

a, b, c = map(int, (input() for _ in range(3)))
l = lcmx(a, b, c)
x, y, z = l//a, l//b, l//c
lag = min(abs(x-y), abs(x-z), abs(y-z))
res = Fraction(l, lag)
print('{}/{}'.format(res.numerator, res.denominator))