#include<iostream>
#include<cstdio>
#include<math.h>
using namespace std;
double f(double x,int y)
{
if(y==1)return sqrt(1+x);
else return sqrt(y+f(x,y-1));
}
int main()
{
double m;
int n;
scanf("%lf%d",&m,&n);
printf("%.2lf",f(m,n));
return 0;
}100'
1166:求f(x,n)
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