/* Cho so tu nhien N bat ki,tinh tong

*S=1+1/2!+1/3!+...+1/N!

*/

public class giaithua{

public static void main (String[] args) {

int k,N=3;

float S=0;

for(k=1;k<=N;k++)

{

S=S+1/sum(k);

}

System.out.println("Ket qua la:"+S);

}

public static float sum(int k)

{

int tich=1;

for(int x=1;x<=k;x++)

{

tich=tich*x;

}

return tich;

}

}