#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;
long gcd(long a,long b){return b?gcd(b,a%b):a;}
long T1,T2,T3;
vector<pair<long,long> >ans;
pair<long,long>mul(long t,pair<long,long>x)
{
	pair<long,long>ret=x;
	ret.second*=t;
	long g=gcd(ret.first,ret.second);
	ret.first/=g;
	ret.second/=g;
	ret.first%=ret.second;
	ret.first=min(ret.first,ret.second-ret.first);
	return ret;
}
void f(long t1,long t2)
{
	pair<long,long>p=make_pair(t1*t2,t2-t1);
	long g=gcd(p.first,p.second);
	p.first/=g;
	p.second/=g;
	pair<long,long>X[3]={mul(T1,p),mul(T2,p),mul(T3,p)};
	if(X[0]==X[1]&&X[1]==X[2]&&X[2]==X[0])ans.push_back(p);
}
long calc(long X,long a,long b)
{
	long ret=1;
	for(long i=1;i*i<=X;i++)
	{
		if(X%i==0)
		{
			if(a%i==b%i||i-a%i==b%i)ret=max(ret,i);
			long j=X/i;
			if(a%j==b%j||j-a%j==b%j)ret=max(ret,j);
		}
	}
	return ret;
}
main()
{
	cin>>T1>>T2>>T3;
	long lcm=T1/gcd(T1,T2)*T2;
	lcm=lcm/gcd(lcm,T3)*T3;
	ans.push_back(make_pair(lcm,1));
	ans.push_back(make_pair(lcm,calc(lcm/T1-lcm/T2,lcm/T1,lcm/T3)));
	ans.push_back(make_pair(lcm,calc(lcm/T1-lcm/T3,lcm/T1,lcm/T2)));
	ans.push_back(make_pair(lcm,calc(lcm/T2-lcm/T3,lcm/T2,lcm/T1)));
	f(T1,T2);
	f(T1,T3);
	f(T2,T3);
	sort(ans.begin(),ans.end(),[](pair<long,long>a,pair<long,long>b){
		return a.first*b.second<b.first*a.second;
	});
	long g=gcd(ans[0].first,ans[0].second);
	cout<<ans[0].first/g<<"/"<<ans[0].second/g<<endl;
}