// コメント修正して再提出.
#include <bits/stdc++.h>
using namespace std;
typedef long long LL;

int main() {
    
    // 1. 入力情報取得.
    LL T1, T2, T3;
    cin >> T1 >> T2 >> T3;
    
    // 2. P3固定で考えてみる.
    // P1, P3 の 速さの差分 … (L / T1 - L / T3) -> T13 = L / (L / T1 - L / T3) = (T1 * T3) / (T3 - T1)[秒] で, 1周差.
    // P2, P3 の 速さの差分 … (L / T2 - L / T3) -> T23 = L / (L / T2 - L / T3) = (T2 * T3) / (T3 - T2)[秒] で, 1周差.
    LL molT13 = T1 * T3, denT13 = T3 - T1, molT23 = T2 * T3, denT23 = T3 - T2;
    
    // 3. T13(= molT13 / denT13), T23(= molT23 / denT23) の 約分.
    LL gcd13 = __gcd(molT13, denT13);
    molT13 /= gcd13, denT13 /= gcd13;
    LL gcd23 = __gcd(molT23, denT23);
    molT23 /= gcd23, denT23 /= gcd23;
    
    // 4. T13, T23 の 通分.
    LL gcdDenT123 = __gcd(denT13, denT23);
    LL lcmDenT123 = denT13 / gcdDenT123 * denT23;
    molT13 *= (lcmDenT123 / denT13), molT23 *= (lcmDenT123 / denT23);

    // 5. T13, T23 の 分子 の 最小公倍数.
    LL gcdMolT123 = __gcd(molT13, molT23);
    LL lcmMolT123 = molT13 / gcdMolT123 * molT23;
    
    // 6. 分子・分母 の 約分 ～ 後処理.
    // ex.
    // [入力例]
    // 3003
    // 5005
    // 7007
    // -> 105105/2 と思われる. 
    LL molLCM = lcmMolT123;
    LL denLCM = lcmDenT123;
    LL gcd123 = __gcd(lcmMolT123, lcmDenT123);
    molLCM /= gcd123, denLCM /= gcd123;
    cout << molLCM << "/" << denLCM << endl;
    return 0;
    
}