#include<iostream>
using namespace std;
long T1,T2,T3;
long gcd(long a,long b){return b?gcd(b,a%b):a;}
main()
{
	cin>>T1>>T2>>T3;
	for(long k=1;k<=10000;k++)
	{
		long ta=T1*T2*k,tb=T2-T1;
		long g=gcd(ta,tb);
		ta/=g;tb/=g;
		long a1,b1,a2,b2;
		a1=ta,b1=tb*T1;
		g=gcd(a1,b1);
		a1/=g;b1/=g;
		a1%=b1;
		a2=ta,b2=tb*T3;
		g=gcd(a2,b2);
		a2/=g;b2/=g;
		a2%=b2;
		if(a1==a2&&b1==b2)
		{
			cout<<ta<<"/"<<tb<<endl;
			return 0;
		}
	}
}