#include<bits/stdc++.h> #include #include #include <math.h> #include #include <stdio.h> #include #include #include <string.h> #include #include #include #include #include #include using namespace std; #define LL long long const int N = 1e5 + 10; const int INF = 0x3f3f3f3f; int main(){ int h, r; cin >> h >> r; double v = M_PI * r * r * h; int n = ceil(20000.0 / v); cout << n << endl; return 0; }