/**
 *   @FileName	a.cpp
 *   @Author	kanpurin
 *   @Created	2020.05.31 01:20:22
**/

#include "bits/stdc++.h" 
using namespace std; 
typedef long long ll;

//gcd
template<typename T>
T gcd(T a, T b) {
    return b ? gcd(b, a%b) : a;
}
int main() {
    ll t1,t2,t3;cin >> t1 >> t2 >> t3;
    ll p1 = t1*t2, q1 = t2-t1;
    ll p2 = t1*t3, q2 = t3-t1;
    ll g1 = gcd(p1,q1);
    ll g2 = gcd(p2,q2);
    p1 /= g1;
    q1 /= g1;
    p2 /= g2;
    q2 /= g2;
    ll ans1 = p1*q2/gcd(p1*q2,p2*q1)*p2;
    ll ans2 = q2;
    ll g3 = gcd(ans1,ans2);
    ans1 /= g3;
    ans2 /= g3;
    cout << ans1 << "/" << ans2 << endl;
    return 0;
}