OI-codes/problem/P4326/P4326.cpp

#include <bits/stdc++.h>

using namespace std;

const double pi = 3.14159265358979323;

int main() {
    int r;
    scanf("%d", &r);
    printf("%.6lf\n%.6lf\n", r * r * pi, r * r * 2.0);
    return 0;
}