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include <iostream>
include <cmath>
using namespace std;
define ll long long
int main() { double n,m=0; cin>>n; for(double i=1; i<=n; i++) { m+=(1/(i*(i+1))); } cout.precision(6); cout<<m; }
//This Code Is Made By ZeydReshaddanPro
include <iostream>
include <cmath>
using namespace std;
define ll long long
int main () { double n, m = 0; cin >> n; for (double i = 1; i <= n; i++) { m += (1 / (i * (i + 1))); } cout.precision (6); cout << m; }
//This Code Is Made By Ayxan113
include <iostream>
include <cmath>
using namespace std; int main () { double n, m = 0; cin >> n; for (double i = 1; i <= n; i++) { m += (1 / (i * (i + 1))); } cout.precision (6); cout << m; }//NAHID ZEYD VE RESADDAN PROOOOOO!!!!!!!!!!!