//1.6:tinh gan dung.

#include<stdio.h>

#include<conio.h>

#include<math.h>

int n,i,k ;

float can;

void main()

{

clrscr();

printf("Nhap so N:

");

scanf("%d", &n);

k=n;

can=0;

do

{

can=sqrt(2*k+can);

k--;

}

while (k>=1);

printf("Ket qua bai toan la: %0.4f", can);

getch();

}