#include<cstdio>
#include<iostream>
using namespace std;


int main(){
	long long a,b,c,d,t;
	long long a1;
	scanf("%d%d%d",&a,&b,&c);
	if(a>b){
		d = a;
		a = b;
		b = d;
	}
	if(a>c){
		d = a;
		a = c;
		c = d;
	}
	if(b>c){
		d = b;
		b = c;
		c = d;
	}
	int m=a,n=c;
	while(n!=0){
		t=m%n;
		m=n;
		n=t;
	}
	a=a/m;
	c=c/m;
	printf("%d/%d",a,c);
		
	return 0;
}