UVA/PIDigits/main.cpp


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#include<bits/stdc++.h>
#include <iomanip>

using namespace std;

typedef long long ll;
typedef pair<int, int> ii;
typedef vector<ii> vii;
typedef vector<int> vi;

#define INF 1000000000

int main () {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
  int n;
  cin >> n;
  double PI = acos(-1);
  cout << setprecision(n + 1) << PI << '\n';
}