#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
ll x, y, z;
ll gcd(ll a, ll b) {
	if (b == 0) return a;
	return gcd(b, a % b);
}
ll lcm(ll a, ll b) {
	return a / gcd(a, b) * b;
}
void yuefen(ll &a, ll &b) {
	ll g = gcd(a, b);
	a /= g; b /= g;
}

int main() {
	ios::sync_with_stdio(false);
	cin >> x >> y >> z;
	ll p = x * y, q = abs(x - y);
	yuefen(p, q);
	for (ll rt = 1; ; rt ++) {
		ll tmpp = p, tmpq = q;
		p *= rt; yuefen(p, q);
		if ((p * abs(x - z)) % (q * x * z) == 0
		&& (p * abs(y - z)) % (q * y * z) == 0) {
			cout << p << "/" << q << "\n";
			return 0;
		}
		p = tmpp; q = tmpq;
	}
	return 0;
}