#include <bits/stdc++.h>
using namespace std;
long long fac(int x) {
  long long t = 1;
  for (int i = x; i > 1; i--) {
    t *= i;
  }
  return t;
}
long long com(int x, int y) {
  if (x < y) return 0;
  long long t = 1;
  int u = min(x - y, y);
  for (int i = x; i > x - u; i--) {
    t *= i;
  }
  long long p = 1;
  for (int j = 1; j <= u; j++) {
    p *= j;
  }
  return t / p;
}
long long powa(long long x, long long y) {
  long long a = 1;
  for (int i = 0; i < y; i++) {
    a *= x;
  }
  return a;
}
int main() {
  int a, b;
  cin >> a >> b;
  if (max(a, b) == 1)
    cout << 1 << "/" << 1 << endl;
  else {
    if (6 % ((6 - max(a, b)) + 1) == 0)
      cout << 1 << "/" << 6 / ((6 - max(a, b)) + 1) << endl;
    else {
      if (((6 - max(a, b)) + 1) % 2 == 0)
        cout << ((6 - max(a, b)) + 1) / 2 << "/" << 3 << endl;
      else
        cout << ((6 - max(a, b)) + 1) << "/" << 6 << endl;
    }
  }
  return 0;
}
