def solve(p,q,r,s):
    x = q*r//gcd(p*s,q*r)
    return x*p,q

def get(a,b):# 正面衝突、背面衝突が何秒ごとか？
    p1,q1 = a*b,a+b
    g = gcd(a,b)
    x,y = b//g, a//g
    if x%2 == y%2 == 1:
        t = 2*(x-x*(a+b)//2//b)
    else:
        t = 2*x - x*(a+b)//b
    p2, q2 = x*a, t        
    return [(p1,q1),(p2,q2)]


from math import gcd
a,b,c = map(int,open(0).read().split())
ans = [solve(p,q,r,s) for p,q in get(a,b) for r,s in get(a,c)]
ans.sort(key = lambda x: x[0]/x[1])
p,q = ans[0]
g = gcd(p,q)
print(f"{p//g}/{q//g}")