#include <cstdio>
#include <cstring>
#include <iostream>
#include <string>
#include <cmath>
#include <bitset>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <deque>
#include <algorithm>
#include <complex>
#include <unordered_map>
#include <random>
using namespace std;
typedef long long int ll;
typedef pair<int, int> P;
ll gcd(ll a, ll b){
	if(b==0) return a;
	return gcd(b, a%b);
}
int main()
{
	ll t1, t2, t3; cin>>t1>>t2>>t3;
	ll g=gcd(t1*(t3-t2), t3*(t2-t1));
	ll d=gcd(t1*t2*t3, g);
	printf("%lld/%lld\n", t1*t2*t3/d, g/d);
	return 0;
}