#include<iostream>
#include<cstdio>
#include<cmath>
using namespace std;
int main(){
	int h,r,b;
	double v,a;
	scanf("%d %d",&h,&r);
	v = 3.14*r*r*h;
	a = 20000/v;
	b = ceil(a);
	printf("%d",b);
	return 0;
}

#include <bits/stdc++.h>
using namespace std;
int main()
{
    int h,r;
    cin>>h>>r;
    int end = 20000/(3.14*r*r*h)+1;
    cout<<end;
    return 0;
}

//(water problem)
#include<bits/stdc++.h>
//#pragma GCC optimize (3)
using namespace std;
inline int read(){	//无聊的快读
    int s=0,w=1;
    char c=getchar();
    while(!isdigit(c)) w=-1,c=getchar();
    while(isdigit(c)) s=s*10+(c^48),c=getchar();
    return s*w;
}
inline void write(int x){	//无聊的快写
	if(x<0) putchar('-'),x=-x;
    if(x>9) write(x/10);
    putchar(x%10+'0');
}
int main()
{
	int h=read(),r=read();
	double S=3.14159265*r*r*h/1000;
	write(int(ceil(20/S)));
    return 0;
}