1 #include <cstdio>
 2 #include <iostream>
 3 #include <cmath>
 4 using namespace std;
 5 int main()
 6 {
 7     double a,b,k;
 8     while(scanf("%lf %lf",&a,&b) != EOF)
 9     {
10 
11         if(a >= 10000 && b >= 1000)
12         {
13             break;
14         }
15         k=0;
16         while (b--)
17         {
18             k = k + a;
19             a = sqrt(a);
20         }
21         printf("%.2f\n",k);
22     }
23     return 0;