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

int main()
{
	int a[3];
	cin>>a[0]>>a[1]>>a[2];
	sort(a,a+3);
	cout<<(a[0]/__gcd(a[0],a[2]))<<"/"<<(a[2]/__gcd(a[0],a[2]));
	return 0;
 }