#include<iostream>
#include<cmath>
#include<algorithm>
#include<cstdio>
#include<string>
using namespace std;
string res[7]={"0/1", "1/6", "1/3", "1/2", "2/3", "5/6", "1/1"};
int main(){
	int a,b;	
	cin>>a>>b;
	cout<<res[7-max(a, b)];
	return 0;
}