# include <stdio.h>

int main(void)
{
	   int a, b, c, t, i, j;
	   int p[3];
   
 
	   scanf("%d %d %d", &a, &b, &c);

	   if (a>b)
	   {
		   t = a;
		   a = b;
		   b = t;
	   }
	   if (a>c)
	   {
		   t = a;
		   a = c;
		   c = t;
	   }
	   if (b>c)
	   {
		   t = b;
		   b = c;
		   c = t;
	   }



	   p[0] = a;
	   p[1] = c;
	   for (i=0; j != 0; ++i)
	   {      	   
		  j = p[1]-p[0];
		  p[1] = p[0];
		  p[0] = j;
	   }
   
	   printf("%d/%d\n", a/p[1], c/p[1]);

	   return 0;
}