#include <iostream>
#include <vector>
#include <cstdio>
#include <sstream>
#include <map>
#include <string>
#include <algorithm>
#include <queue>
#include <cmath>
#include <set>
using namespace std;

long long gcd(long long a, long long b){
	if(b==0) return a;
	return gcd(b, a%b);
}

long long lcm(long long a, long long b){
	if(a<b) swap(a,b);
	if(b==1) return a;
	return a * (b/gcd(a,b));
}

struct fraction{
	long long N;
	long long D;
	fraction(long long n, long long d){
		N = n;
		D = d;
		long long g = gcd(N,D);
		N /= g;
		D /= g;
	}
	fraction(){
		N = 1e12;
		D = 1;
	}
	fraction operator*(const fraction& x){
		return fraction(this->N * x.N, this->D * x.D);
	}

	bool operator<(const fraction& x) const{
		long long l = lcm(this->D, x.D);
		return (this->N * (l/this->D)) < (x.N * (l/x.D));
	}

	void print(){
		cerr << N << "/" << D << endl;
	}

};

int main(){
	vector<long long> T(3);
	for(int i=0; i<3; i++){
		cin >> T[i];
	}

	vector<fraction> ans(4);
	for(int i=0; i<4; i++){
		vector<long long> A(2), B(2);
		vector<long long> N(2), D(2);
		vector<long long> g(2);

		A[0] = T[1] + T[0] * ((i&1)?1:-1);
		B[0] = T[1] * T[0];

		A[1] = T[2] + T[1] * ((i&2)?1:-1);
		B[1] = T[2] * T[1];

		for(int k=1; k<=1000000; k++){
			fraction t(B[0] * k, A[0]);
			fraction tmp(A[1], B[1]);

			tmp = tmp * t;

			if(tmp.D == 1){
				ans[i] = t;
				break;
			}
		}
	}

	sort(ans.begin(), ans.end());
	cout << ans[0].N << "/" << ans[0].D << endl;
/*
	for(int i=0; i<4; i++){
		cerr << ans[i].N << "/" << ans[i].D << endl;
	}
*/
	return 0;
}