#include<stdio.h>
long fact(long n);

double s(int x);
int main()
 {
    int x;
    printf("enter :");
    scanf("%d",&x);
    printf("\ns(%d)=%f",x,s(x));
    return 0;

}

long fact(long n);
 {
     int i,t;
     long s=1;
    for (i=1;i<=n;i++)
     {
         if(i%2==0) continue;
         else
         {
              s=s*i;
              t=t+s;   
         }
     }
     return n;
 }
double s(int x)
{
    double result=1.0,tmp;
    int i=1,sign=1;
    do{
        tmp=sign/i*fact(i++);
        sign=-sign;
        result+=tmp;
    }while(tmp>=1e-6);
return    result;
}