using namespace std;
int main(){	
	int a,b,c,t1,t2,t3,i,n;
	scanf("%d %d %d",&a,&b,&c);
	t1=a>=b?a:b;
	t2=t1>=c?t1:c;
	if(t2==a) t3=b>=c?c:b;
	if(t2==b) t3=a>=c?c:a;
	if(t2==c) t3=a>=b?b:a;
	for(i==1;i<=t3;i++)
	{if(t2/i==0 && t3/i==0)    n=i; 
	}
 printf("%d/%d",t3/n,t2/n);
				
	return 0;
}