from math import gcd, lcm
from fractions import Fraction as Frac

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

x = Frac(a * b, abs(a - b))
y = Frac(a * c, abs(a - c))


def lcm_frac(a: Frac, b: Frac) -> Frac:
    n1, d1 = a.numerator, a.denominator
    n2, d2 = b.numerator, b.denominator
    num = lcm(n1, n2)
    den = gcd(d1, d2)
    return Frac(num, den)


ans = lcm_frac(x, y)
print(f'{ans.numerator}/{ans.denominator}')