#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); i++)
#define rep2(i, a, b) for (int i = (a); i < (b); i++)
#define rrep(i, n) for (int i = (n) - 1; i >= 0; i--)
#define rrep2(i, a, b) for (int i = (a) - 1; i >= (b); i--)
#define all(v) (v).begin(), (v).end()
using namespace std;
typedef long long ll;
const ll inf = 1e9;
const ll mod = 1e9 + 7;

ll lcm(ll x, ll y) {
    return x / __gcd(x, y) * y;
}

int main() {
    ll T[3];
    rep (i, 3) cin >> T[i];

    ll U[6];

    sort(T, T + 3);

    U[0] = T[0] + T[1];
    U[1] = T[1] + T[2];
    U[2] = T[2] + T[0];
    U[3] = T[1] - T[0];
    U[4] = T[2] - T[1];
    U[5] = T[2] - T[0];

    ll m = U[0];

    rep (i, 6) m = lcm(m, U[i]);

    ll S[6];
    S[0] = m * T[0] * T[1] / (T[0] + T[1]);
    S[1] = m * T[1] * T[2] / (T[1] + T[2]);
    S[2] = m * T[2] * T[0] / (T[2] + T[0]);
    S[3] = m * T[0] * T[1] / (T[1] - T[0]);
    S[4] = m * T[1] * T[2] / (T[2] - T[1]);
    S[5] = m * T[2] * T[0] / (T[2] - T[0]);

    ll n[8];
    n[0] = lcm(S[0], lcm(S[1], S[2]));
    n[1] = lcm(S[3], lcm(S[1], S[2]));
    n[2] = lcm(S[0], lcm(S[4], S[2]));
    n[3] = lcm(S[3], lcm(S[4], S[2]));
    n[4] = lcm(S[0], lcm(S[1], S[5]));
    n[5] = lcm(S[3], lcm(S[1], S[5]));
    n[6] = lcm(S[0], lcm(S[4], S[5]));
    n[7] = lcm(S[3], lcm(S[4], S[5]));

    ll x = *min_element(n, n + 8);

    ll g = __gcd(m, x);

    m /= g;
    x /= g;

    cout << x << "/" << m << endl;
}