#include<iostream>

using namespace std;

int gcd(int a,int b){
	if(a<b) return gcd(b,a);
	if(b!=0) return gcd(b,a%b);
	return a;
}

int main(){

	int T1,T2,T3;

	cin>>T1>>T2>>T3;

	int N=gcd(T1,T2);
	int A=T1*T2/N;
	N=gcd(A,T3);
	A=A*T3/N;

	cout<<A<<"/";

	int K1=A/T1;
	int K2=A/T2;
	int K3=A/T3;

	for(int i=A;i>=1;i--){
		if(K1%i==K2%i&&K2%i==K3%i){
			cout<<i<<endl;
			break;
		}
	}

}