#include <bits/stdc++.h>
using namespace std;

typedef long long loong;

loong gcd(loong a,loong b){return a?gcd(b%a,a):b;}

loong T1,T2,T3;

int main(){
	cin >> T1 >> T2 >> T3;
	loong d=T1*T2*T3;
	loong n1=(T3-T1)*T2;
	loong n2=(T2-T1)*T3;
	loong n=gcd(n1,n2);
	loong g=gcd(n,d);
	cout << d/g << "/" << n/g << endl;
	return 0;
}