1 #include<cstdio>
 2 #include<cmath>
 3 int main()
 4 {
 5     float m;int n;
 6     while(scanf("%f%d",&m,&n)!=EOF)
 7     {
 8         float s=0;                            
 9         for(int i=1;i<=n;i++)
10         {               
11             s=s+m;//81 9 3 1.732
12             m=sqrt(m);
13         }
14         printf("%.2f\n",s);
15     }
16     return 0;
17 }