#include<iostream>
#include<fstream>
#include<sstream>
#include<string>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<ctime>
#include<stack>
#include<queue>
#include<set>
#include<map>
#include<vector>
#include<list>
#include<algorithm>
#include<utility>
#include<complex>
#include<functional>
using namespace std;

typedef long long LL;
typedef pair<LL, LL> P;
LL L;
LL gcd(LL a, LL b){
	return (b == 0) ? a : gcd(b, a%b);
}
bool comp(P a, P b){
	LL c = a.second*b.second/gcd(a.second, b.second);
	a.first *= c / a.second;
	b.first *= c / b.second;
	return a.first < b.first;
}

P solve(LL x,LL y){
	LL u = (y*L)/gcd(x, y);
	return make_pair(u / gcd(u, y), y / gcd(u, y));
}

int main(void){
	LL a, b, c;
	cin >> a >> b >> c;
	L = a*b*c;
	a = L / a;
	b = L / b;
	c = L / c;
	P res = make_pair(a*b*c, 1ll);
	{auto tmp = solve(a + b, a + c); if (comp(tmp, res))res = tmp; }
	{auto tmp = solve(a + c, a + b); if (comp(tmp, res))res = tmp; }
	{auto tmp = solve(c + b, a + c); if (comp(tmp, res))res = tmp; }
	{auto tmp = solve(a + b, b + c); if (comp(tmp, res))res = tmp; }
	{auto tmp = solve(a + c, c + b); if (comp(tmp, res))res = tmp; }
	{auto tmp = solve(c + b, a + b); if (comp(tmp, res))res = tmp; }
	{auto tmp = solve(abs(a - b), a + c); if (comp(tmp, res))res = tmp; }
	{auto tmp = solve(abs(a - c), a + b); if (comp(tmp, res))res = tmp; }
	{auto tmp = solve(abs(c - b), a + c); if (comp(tmp, res))res = tmp; }
	{auto tmp = solve(abs(a - b), b + c); if (comp(tmp, res))res = tmp; }
	{auto tmp = solve(abs(a - c), c + b); if (comp(tmp, res))res = tmp; }
	{auto tmp = solve(abs(c - b), a + b); if (comp(tmp, res))res = tmp; }
	{auto tmp = solve(abs(a - b), abs(a - c)); if (comp(tmp, res))res = tmp; }
	{auto tmp = solve(abs(a - c), abs(a - b)); if (comp(tmp, res))res = tmp; }
	{auto tmp = solve(abs(c - b), abs(a - c)); if (comp(tmp, res))res = tmp; }
	{auto tmp = solve(abs(a - b), abs(b - c)); if (comp(tmp, res))res = tmp; }
	{auto tmp = solve(abs(a - c), abs(c - b)); if (comp(tmp, res))res = tmp; }
	{auto tmp = solve(abs(c - b), abs(a - b)); if (comp(tmp, res))res = tmp; }
	cout << res.first << "/" << res.second << endl;
	return(0);
}