Tính S(n) = CanBac2(n! + CanBac2((n-1)! +CanBac2((n – 2)! + … + CanBac2(2!) + CanBac2(1!)))) có n dấu căn

#include<stdio.h>
#include<conio.h>
#include<math.h>
int main()
{
	int i, n;
	float S, M;
	do
	{
		printf("\nNhap n(n >= 1): ");
		scanf("%d", &n);

		if(n < 1)
		{
			printf("\nn phai >= 1. Xin nhap lai !");
		}
	}while(n < 1);
	i = 1;
    M = 1;
	S = sqrt((float)0);

	while(i <= n)
	{
		M = M * i;
		S = sqrt(M + S);
		i++;
	}
	printf("\nTong la %f", S);

	getch();
	return 0;
}