#include <bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c;
	cin>>a>>b>>c;
	int minn=100000;
	if(a<minn){
		minn=a;
	}
	if(b<minn){
		minn=b;
	} 
	if(c<minn){
		minn=c;
	}
	int maxx=-1;
	if(a>maxx){
		maxx=a;
	}
	if(b>maxx){
		maxx=b;
	} 
	if(c>maxx){
		maxx=c;
	}
	printf("%d/%d",minn/__gcd(minn,maxx),maxx/__gcd(minn,maxx));
}