#include <bits/stdc++.h>

using namespace std;

int gcd(int m, int n) {
    int r = m % n;
    while (r != 0) {
        m = n;
        n = r;
        r = m % n;
    }
    return n;
}

int lcm(int m, int n) {
    return m / gcd(m,n) * n; 
}

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int a,b,c,tmp,x,y,z,tmp2;
    cin >> a >> b >> c;
    tmp = lcm(a, lcm(b,c));
    a = tmp / a;
    b = tmp / b;
    c = tmp / c;
    for(int i = max(a, max(b, c)); i >= 2; i--) {
        x = a % i;
        y = b % i;
        z = c % i;
        if (x == y && y == z) {
            tmp2 = gcd(tmp,i);
            cout << tmp / tmp2 << '/' << i / tmp2 << "\n";
            return 0;
        }
    }
    cout << tmp << '/' << 1 << "\n";
    return 0;
}