#include<bits/stdc++.h>

using namespace std;

int main() {
    int a, b, c, s, x;
    cin >> a >> b >> c;
    s = min (a, max(b, c));
    x = max (a, max(b, c));
    for (int i = 2; i < x; i++) {
        if (s % i == 0 && x % i == 0) {
            s = s / i;
            x = x / i;
        }
    }
    cout << s << "/" << x;
    return 0;
}