#include<stdio.h>
#include<conio.h>
#include<math.h>
int main()
{
int i, n;
float S;
do
{
printf("\nNhap n(n >= 1): ");
scanf("%d", &n);
if(n < 1)
{
printf("\nn phai >= 1. Xin nhap lai !");
}
}while(n < 1);
i = 1;
S = 0;
while(i <= n)
{
S = sqrt(i + S);
i++;
}
printf("\nTong S = %f", S);
getch();
return 0;
}
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