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#include<stdio.h>
#include<math.h>
int main() {
    int m,i;
    double sum,n;
    while(scanf("%lf %d",&n,&m)!=EOF) {
        double a[m];
        a[0]=n;
        sum=n;
        for(i=1; i<m; i++) {
            a[i]=sqrt(a[i-1]);
            sum=sum+a[i];
        }
        printf("%.2lf\n",sum);
    }
    return 0;
}