#include <bits/stdc++.h>
using namespace std;
int gcd(int a, int b) { return b ? gcd(b, a % b) : a; }
int main() {
  int n, m;
  cin >> n >> m;
  int u = 6 - max(n, m) + 1;
  int g = gcd(6, u);
  cout << u / g << "/" << 6 / g;
}
