#include <string>
#include <vector>
#include <algorithm>
#include <numeric>
#include <set>
#include <map>
#include <queue>
#include <iostream>
#include <sstream>
#include <cstdio>
#include <cmath>
#include <ctime>
#include <cstring>
#include <cctype>
#include <cassert>
#include <limits>
#include <functional>
#define rep(i,n) for(int (i)=0;(i)<(int)(n);++(i))
#define rer(i,l,u) for(int (i)=(int)(l);(i)<=(int)(u);++(i))
#define reu(i,l,u) for(int (i)=(int)(l);(i)<(int)(u);++(i))
#if defined(_MSC_VER) || __cplusplus > 199711L
#define aut(r,v) auto r = (v)
#else
#define aut(r,v) __typeof(v) r = (v)
#endif
#define each(it,o) for(aut(it, (o).begin()); it != (o).end(); ++ it)
#define all(o) (o).begin(), (o).end()
#define pb(x) push_back(x)
#define mp(x,y) make_pair((x),(y))
#define mset(m,v) memset(m,v,sizeof(m))
#define INF 0x3f3f3f3f
#define INFL 0x3f3f3f3f3f3f3f3fLL
using namespace std;
typedef vector<int> vi; typedef pair<int,int> pii; typedef vector<pair<int,int> > vpii; typedef long long ll;
template<typename T, typename U> inline void amin(T &x, U y) { if(y < x) x = y; }
template<typename T, typename U> inline void amax(T &x, U y) { if(x < y) x = y; }

template<typename T>T gcd(T x, T y) { return y == 0 ? x : gcd(y,x%y); }
template<typename T>T lcm(T x, T y){ return x == 0 ? 0 : x/gcd(x,y)*y; }

struct Ratio {
	typedef ll T;
	T x, y;
	Ratio(): x(0), y(1) { }
	Ratio(T x_): x(x_), y(1) { }
	Ratio(T x_, T y_): x(x_), y(y_) { normalize(); }
	double toDouble() { return double(x) / y; }
	void normalize() {
		T g = gcd(abs(x), abs(y));
        if(g == 0) return;
		x /= g; y /= g;
		if(y < 0) x = -x, y = -y;
		if(x == 0) y = 1;
	}
	bool operator==(const Ratio& q) const { return x == q.x && y == q.y; }
	bool operator!=(const Ratio& q) const { return x != q.x || y != q.y; }
	bool operator<(const Ratio& q) const { return x*q.y < y*q.x; }
	bool operator<=(const Ratio& q) const { return x*q.y <= y*q.x; }
	bool operator>(const Ratio& q) const { return x*q.y > y*q.x; }
	bool operator>=(const Ratio& q) const { return x*q.y >= y*q.x; }
	Ratio& operator+=(const Ratio& q) {
		T g = gcd(y,q.y); x = q.y/g*x + y/g*q.x, y = y/g*q.y; normalize();
		return *this;
	}
	Ratio& operator-=(const Ratio& q) {
		T g = gcd(y,q.y); x = q.y/g*x - y/g*q.x, y = y/g*q.y; normalize();
		return *this;
	}
	Ratio& operator*=(const Ratio& q) {
		x = x*q.x, y = y*q.y; normalize();
		return *this;
	}
	Ratio& operator/=(const Ratio& q) {
		x = x*q.y, y = y*q.x; normalize();
		return *this;
	}
	Ratio operator+(const Ratio& q) const { return Ratio(*this) += q; }
	Ratio operator-(const Ratio& q) const { return Ratio(*this) -= q; }
	Ratio operator*(const Ratio& q) const { return Ratio(*this) *= q; }
	Ratio operator/(const Ratio& q) const { return Ratio(*this) /= q; }
	Ratio operator-() const { return Ratio(-x, y); }
};
ostream& operator<<(ostream &o, const Ratio& p) { o << p.x << "/" << p.y; return o; }
Ratio lcm(Ratio a, Ratio b) {
	return Ratio(lcm(a.x, b.x), gcd(a.y, b.y));
}


int main() {
	ll T1, T2, T3;
	while(cin >> T1 >> T2 >> T3) {
		//((a / T1 - b / T2) x mod 1 = 0
		Ratio ans(INFL, 1);
		ll T = T1 * T2 * T3;
		rer(a, -1, 1) if(a != 0)
		rer(b, -1, 1) if(b != 0)
		rer(c, -1, 1) if(c != 0)
		{
			ll X = lcm(abs(a * T2 - b * T1), abs(b * T3 - c * T1));
			Ratio t(T1 * T2, abs(a * T2 - b * T1));
			Ratio u(T1 * T3, abs(b * T3 - c * T1));
			amin(ans, lcm(t, u));
			/*
			for(ll x = 1; ; ++ x) {
				bool ok1 = (a * T2 - b * T1) * x % (T1 * T2 * 12) == 0;
				bool ok2 = (b * T3 - c * T1) * x % (T1 * T3 * 12) == 0;
				if(ok1 && ok2) {
					cerr << a << ", " << b << ", " << c << ": " << x << "; " << t << ", " << u << endl;
					amin(ans, x);
					break;
				}
			}*/
		}
		cout << ans << endl;
	}
	return 0;
}