#include "bits/stdc++.h" using namespace std; typedef long long ll; typedef pair pii; typedef pair pll; const int INF = 1e9; const ll LINF = 1e18; template ostream& operator << (ostream& out,const pair& o){ out << "(" << o.first << "," << o.second << ")"; return out; } template ostream& operator << (ostream& out,const vector V){ for(int i = 0; i < V.size(); i++){ out << V[i]; if(i!=V.size()-1) out << " ";} return out; } template ostream& operator << (ostream& out,const vector > Mat){ for(int i = 0; i < Mat.size(); i++) { if(i != 0) out << endl; out << Mat[i];} return out; } template ostream& operator << (ostream& out,const map mp){ out << "{ "; for(auto it = mp.begin(); it != mp.end(); it++){ out << it->first << ":" << it->second; if(mp.size()-1 != distance(mp.begin(),it)) out << ", "; } out << " }"; return out; } /* 問題文============================================================ ================================================================= 解説============================================================= ================================================================ */ inline ll gcd(ll a, ll b) { return b ? gcd(b, a%b) : a; } inline ll lcm(ll a, ll b) { return a / gcd(a, b)*b; } string solve(){ string res; ll t1,t2,t3; cin >> t1 >> t2 >> t3; ll X = t1*t2*t3; vector Y1 = {(t3-t1)*t2,(t3-t1)*t2,(t3+t1)*t2,(t3-t1)*t2}; vector Y2 = {(t3-t2)*t1,(t3+t2)*t1,(t3-t2)*t1,(t3+t2)*t1}; ll maxbunbo = 0; for(int i = 0; i < Y1.size();i++){ ll bunbo = gcd(Y1[i],Y2[i]); maxbunbo = max(bunbo,maxbunbo); } ll waru = gcd(X,maxbunbo); X /= waru; maxbunbo /= waru; res = to_string(X) + "/" + to_string(maxbunbo); return res; } int main(void) { cin.tie(0); ios_base::sync_with_stdio(false); cout << solve() << endl; return 0; }