#include <cstdio> #include <climits> #include <iostream> #include <algorithm> #include <string> #include <cstdio> #include <climits> #include <iostream> #include <algorithm> #include <string> #include <vector> #include <utility> #include <queue> #include <cstring> #define rep(i, n) for (int i = 0; i < (n); i++) using namespace std; const long long MOD = 1000000007; typedef long long ll; int main(int argc, char *argv[]) { double n; cin >> n; cout << (1/n) << endl; return 0; }