#include <stdio.h>
int main()
{
	int a,b,c,d,e,f;
	scanf("%d%d%d",&a,&b,&c);
	if(a>b)
	{
		d=a;
		a=b;
		b=d;
	}
	if(a>c)
	{
		d=c;
		c=a;
		a=d;
	}
	if(b>c)
	{
		d=b;
		b=c;
		c=b;
	}
	e=a;
	f=c;
	while(f)
	{
		d=e%f;
		e=f;
		f=d;
	}
	int x,y;
	x=a/e;
	y=c/e;
	printf("%d/%d",x,y);
	return 0;
}