#include<stdio.h>
#include<math.h>
int main()
{
int n,i;
double sums = 0.0, ser;
printf("enter the limit:");
scanf("%d",&n);
for (i = 1; i <= n; ++i) {
ser = 1 / pow(i, i);
sums += ser;
}
printf("%.5f", sums);
return 0;
}