#include #include #include #include #include #include #include #include #include #include #include #include using namespace std; using ll = long long; int main(){ long double R, pi=M_PI, S, T, U; int K; cin >> R >> K; S = pi*R*R / (long double) (K+1); vector v; long double l, r, c; if (K % 2 == 0){ T = 0; for (int i=0; i