#include<bits/stdc++.h>
#include <algorithm>
using namespace std;
int b(unsigned long long k,unsigned long long f){
	for(int i=2;i<=k;i++){
		if(k%i==0&&f%i==0) return i;
	}
	return 1;
}
int main(){
    unsigned long long a[5];
    cin>>a[1]>>a[2]>>a[3];
    sort(a+1,a+4);
    if(b(a[1],a[3])==1) printf("%d/%d",a[1],a[3]);
    else{
    	while(b(a[1],a[3])==1)
    	printf("%d/%d",a[1],a[3]);
	}
    return 0;
}