#include<stdio.h>
int main(){
    int a,b,d = 0;
    scanf("%d%d",&b,&a);
    double c;
    c=3.14*a*a*b;
    for(int e=20000;e>=0;e=e-c){
        ++d;
    }
    printf("%d",d);
    return 0;
}