#include<iostream>
using namespace std;
int main()
{
    int r;
    int count=0;
    cin>>r;
    double n1 = 3.14;
    double n2 = 3.14*r*r;
    if(n2 == n1){
        cout<<"0"<<endl;
    }
    else{
        while(n2 > 1){
            count++;
            n2-= n1;
        }
        cout<<count<<endl;
    }

    return 0;
}
