#include <bits/stdc++.h>
int gcd(int x, int y) { return y == 0 ? x : gcd(y, x % y); }
using namespace std;
int main(void) {
  int m, n;
  scanf("%d%d", &m, &n);
  int t = m > n ? m : n;
  int x = 7 - t;
  int y = 6;
  if (x == 0) {
    printf("0/1\n");
    return 0;
  }
  m = gcd(x, y);
  x /= m;
  y /= m;
  printf("%d/%d\n", x, y);
  return 0;
}
