#!/usr/bin/env python3
# %%
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
from fractions import Fraction
import itertools

# %%
A, B, C = map(int, read().split())


# %%
def lcm_frac(a, b):
    return b * (b / a).denominator


# %%
AB = [Fraction(A * B, A + B), Fraction(A * B, B - A)]
AC = [Fraction(A * C, A + C), Fraction(A * C, C - A)]
answer = min(lcm_frac(t1, t2) for t1, t2 in itertools.product(AB, AC))

print(f'{answer.numerator}/{answer.denominator}')