> #include<stdio.h>
> 
> int main()
> {
> 	long long int a[101], r, r2;
> 	int n, m, i, j, s, e;
> 	char x;
> 	while (~scanf("%d %d", &n, &m))
> 	{
> 		for (i = 0; i <= 2 * n; i++)
> 			a[i] = 0;
> 		s = e = n;
> 		r2 = a[n] = (long long int)1 << n;
> 		for (j = 0; j < n; j++)
> 		{
> 			for (i = s; i <= e; i += 2)
> 			{
> 				getchar();
> 				x = getchar();
> 				if (x == '*')
> 				{
> 					a[i - 1] += a[i] / 2;
> 					a[i + 1] += a[i] / 2;
> 					a[i] = 0;
> 				}
> 			}
> 			s--;
> 			e++;
> 		}
> 		for (i = 1; i <= 2 * n; i += 2)
> 		{
> 			a[i - 1] += a[i] / 2;
> 			a[i + 1] += a[i] / 2;
> 			a[i] = 0;
> 		}
> 		r = a[2 * m];
> 		if (r)
> 		{
> 			while (!(r % 2))
> 
> 			{
> 				r /= 2;
> 				r2 /= 2;
> 			}
> 			printf("%lld/%lld\n", r, r2);
> 		}
> 		else
> 			printf("0/1\n");
> 	}
> 	return 0;
> }