#include <stdio.h>


double computeE(int);

int main(){
    int n;
    printf("Please enter the number of terms\n");
    scanf("%lf", &n);
    double value = computeE(n);
    printf("answer is %lf", value);

}

double computeE(int n){
    double e;
    double value = 1;
    e = 1;


    for (int i=1; i<=n; i++){

        for (int j=1; j<=i; j++) {

            value = value*j;
             e = e + 1/value;
        }

       value = 1;

    }

    return(e);

}