from fractions import gcd
from fractions import Fraction as frac

t1 = int(input())
t2 = int(input())
t3 = int(input())

def solve(t1, t2, t3):
    # + + 
    M = t3 * (t2 + t1)
    K = t2 * (t3 + t1)
    c = gcd(M, K)
    m = M // c
    k = K // c
    tpp = frac(m * t1 * t2, t1 + t2)
    
    # + -
    M = t3 * (t2 + t1)
    K = t2 * (t3 - t1)
    c = gcd(M, K)
    m = M // c
    k = K // c
    tpm = frac(m * t1 * t2, t1 + t2)
    
    # - +
    M = t3 * (t2 - t1)
    K = t2 * (t3 + t1)
    c = gcd(M, K)
    m = M // c
    k = M // c
    tmp = frac(m * t1 * t2, t2 - t1)
    
    # - -
    M = t3 * (t2 - t1)
    K = t2 * (t3 - t1)
    c = gcd(M, K)
    m = M // c
    k = M // c
    tmm = frac(m * t1 * t2, t2 - t1)
    
    t_min = min(tpp, tpm, tmp, tmm)
    
    print('{}/{}'.format(t_min.numerator, t_min.denominator))

solve(t1, t2, t3)