# include <stdio.h>
double fact(int n)
{
if(n==0||n==1)
{
return 1;
}
else
{
return n*fact(n-1);
}
}
main()
{
float i,sum,n;
scanf("%f",&n);
for(i=1;i<=n;i++)
{
sum=sum+1/fact(i);
}
printf("sum=%.5f",sum);
}
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