#include <bits/stdc++.h>

using namespace std;

int factorial(int n)
{
    if(n > 1)
        return n * factorial(n - 1);
    else
        return 1;
}

int main()
{
    int x;
    double total = 0;
    cin>>x;
    
    for(int i = 1; i <= 9; i++)
    {
        total += pow(x, i)/factorial(i);
    }
    
    cout<<total;
    return 0;
}