#include<bits/stdc++.h>
using namespace std;
int main()
{
	int a,b,c;
	cin>>a>>b>>c;
	if (a%2==0 && b%2==0 && c%2==0) 
	{
		a/=2;
		b/=2;
		c/=2;
	}
	cout<<min(a,min(b,c))<<"/"<<max(a,max(b,c));
	return 0;
} 

要求约分的样例就一项，不用gcd用判断就行了