#include<stdio.h>
#include<math.h>
int factorial (int n);
int main(void){
double x;
double s=0.0;
double sum=0.0;
int n=1;
sancf("%lf",&x);
while(fabs(sum)>=0.00001){
s=1+pow(x,n)/factorial(n);
sum=sum+s;
n++}
printf("%.4lf",&s);
return 0;
}
int factorial(int n)
{
int i,fact=1;
for(i=1;i<=n;i++)
fact=fact*i;
return fact;
}
s =1+ x+x*x/2!+x*x*x/3!+x*x*x*x/4!+……