#include <iostream>
using namespace std;
int main()
{
	int a, b, c, e = 0, f = 100000000000,k=0;
	cin >> a >> b >> c;
	if (a > e)
		e = a;
	if (a < f)
		f = a;
	if (b > e)
		e = b;
	if (b < f)
		f = b;
	if (c > e)
		e = c;
	if (c < f)
		c = f;
	for (int i = e; i >= 1; i--)
	{
		if (e % i == 0 && a % i == 0)
		{
			k = i;
			break;
		}
	}
	cout << f / k << "/" << e/ k;
	return 0;


}