#include <bits/stdc++.h>
#define c int
#define cc cin 
#define ccc double 
#define cccc return
#define ccccc cout
#define cccccc endl
#define ccccccc ceil
using namespace std;
int main()
{
    c h,r,cnt;
    cc>>h>>r;
    ccc zhong,v=3.14159*r*r*h;
    zhong=v/1000;
    cnt=ccccccc(20/zhong);
    ccccc<<cnt<<cccccc;
    cccc 0;
}

能过