import std.algorithm;
import std.array;
import std.ascii;
import std.container;
import std.conv;
import std.math;
import std.numeric;
import std.range;
import std.stdio;
import std.string;
import std.typecons;

void log(A...)(A arg) {
    stderr.writeln(arg);
}
int size(T)(in T s) {
    return cast(int)s.length;
}

long lcm(long a, long b) {
    return a / gcd(a, b) * b;
}

void main() {
    auto T = new long[3];
    foreach (i; 0 .. 3) {
        T[i] = readln.chomp.to!long;
    }
    long l = reduce!((a, b) => lcm(a, b))(1L, T);
    auto v = T.map!((a) => l / a).array;
    real ans = 1e50;
    long ans_n, ans_m;
    for (int bit = 0; bit < 8; bit++) {
        long[] x;
        for (int i = 0; i < 3; i++) {
            if (bit & (1 << i)) {
                x ~= abs(v[i] - v[(i + 1) % 3]);
            } else {
                x ~= v[i] + v[(i + 1) % 3];
            }
        }
        auto g = gcd(x[0], gcd(x[1], x[2]));
        auto y = x.map!((a) => a / g).array;
        auto k = y[0];
        //log(x, " k: ", k);
        auto c = 1.0 * l * k / x[0];
        if (ans > c) {
            ans = c;
            auto p = gcd(l * k, x[0]);
            ans_n = l * k / p;
            ans_m = x[0] / p;
        }
    }
    writefln("%s/%s", ans_n, ans_m);
}