#include <bits/stdc++.h>   using namespace std;   int mpow(int base, int exp);   void solve() {     long double n;     cin >> n;     long double sum = 0;     while (n) {       long double d;       d = (1) * 1.0 / n;       sum += d;       n--;     }     cout << sum <<   n ;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     ;     solve();     return 0;   }   int mpow(int base, int exp) {     base %= 1000000007;     int result = 1;     while (exp > 0) {       if (exp & 1) result = ((long long int)result * base) % 1000000007;       base = ((long long int)base * base) % 1000000007;       exp >>= 1;     }     return result;   }   