#include <bits/stdc++.h>
using namespace std;

typedef long long   signed int LL;
typedef long long unsigned int LU;

#define incID(i, l, r) for(int i = (l)    ; i <  (r); i++)
#define incII(i, l, r) for(int i = (l)    ; i <= (r); i++)
#define decID(i, l, r) for(int i = (r) - 1; i >= (l); i--)
#define decII(i, l, r) for(int i = (r)    ; i >= (l); i--)
#define  inc(i, n) incID(i, 0, n)
#define inc1(i, n) incII(i, 1, n)
#define  dec(i, n) decID(i, 0, n)
#define dec1(i, n) decII(i, 1, n)

#define inII(v, l, r) ((l) <= (v) && (v) <= (r))
#define inID(v, l, r) ((l) <= (v) && (v) <  (r))

#define PB push_back
#define EB emplace_back
#define MP make_pair
#define FI first
#define SE second
#define UB upper_bound
#define LB lower_bound
#define PQ priority_queue

#define  ALL(v)  v.begin(),  v.end()
#define RALL(v) v.rbegin(), v.rend()
#define  FOR(it, v) for(auto it =  v.begin(); it !=  v.end(); ++it)
#define RFOR(it, v) for(auto it = v.rbegin(); it != v.rend(); ++it)

template<typename T> bool   setmin(T & a, T b) { if(b <  a) { a = b; return true; } else { return false; } }
template<typename T> bool   setmax(T & a, T b) { if(b >  a) { a = b; return true; } else { return false; } }
template<typename T> bool setmineq(T & a, T b) { if(b <= a) { a = b; return true; } else { return false; } }
template<typename T> bool setmaxeq(T & a, T b) { if(b >= a) { a = b; return true; } else { return false; } }
template<typename T> T gcd(T a, T b) { return (b == 0 ? a : gcd(b, a % b)); }
template<typename T> T lcm(T a, T b) { return a / gcd(a, b) * b; }

// ---- ----

struct Frac {
	LL p, q;
	Frac() { };
	Frac(LL pp, LL qq) { p = pp; q = qq; }
	bool operator< (const Frac & obj) const { return p * obj.q <  obj.p * q; }
	bool operator==(const Frac & obj) const { return p * obj.q == obj.p * q; }
	Frac operator+ (const Frac & obj) const { return Frac(p * obj.q + obj.p * q, q * obj.q); }
	Frac operator- (const Frac & obj) const { return Frac(p * obj.q - obj.p * q, q * obj.q); }
	Frac operator* (const Frac & obj) const { return Frac(p * obj.p, q * obj.q); }
	Frac operator/ (const Frac & obj) const { return Frac(p * obj.q, q * obj.p); }
};

// ----

Frac f(LL a, LL b, LL c) {
	LL i = 1;
	while(true) {
		Frac x((i * a * b) % (a * (b - a)), a * (b - a));
		Frac y((i * a * b) % (c * (b - a)), c * (b - a));
		Frac z(1, 1);
		if(x == y || x + y == z) { return Frac(i * a * b, b - a); }
		
		i++;
	}
}

int main() {
	LL a, b, c;
	cin >> a >> b >> c;
	
	Frac ans(a * b * c, 1);
	setmin(ans, f(a, b, c));
	setmin(ans, f(a, c, b));
	setmin(ans, f(b, c, a));
	
	LL d = gcd(ans.p, ans.q);
	ans.p /= d;
	ans.q /= d;
	
	cout << ans.p << "/" << ans.q << endl;
	
	return 0;
}