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

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int a,b,c,d;
	cin >> a >> b;
	d = a*a*b*3*0.1;
	c=(20/d)+1; 
	cout<< c ;
    return 0;
}