import math
from functools import reduce

def compute_gcd(a, b):
    return math.gcd(a, b)

def compute_lcm(a, b):
    return a * b // compute_gcd(a, b)

def multi_gcd(numbers):
    return reduce(lambda x, y: compute_gcd(x, y), numbers)

def multi_lcm(numbers):
    return reduce(lambda x, y: compute_lcm(x, y), numbers, 1)

# Read input
T1 = int(input())
T2 = int(input())
T3 = int(input())

pairs = [(T1, T2), (T1, T3), (T2, T3)]

numerators = []
denominators = []

for Ti, Tj in pairs:
    numerator = Ti * Tj
    denominator = Tj - Ti
    g = compute_gcd(numerator, denominator)
    simplified_num = numerator // g
    simplified_den = denominator // g
    numerators.append(simplified_num)
    denominators.append(simplified_den)

lcm_num = multi_lcm(numerators)
gcd_den = multi_gcd(denominators)

print(f"{lcm_num}/{gcd_den}")