#include<bits/stdc++.h>
using namespace std;

int main(){
    long res = 0;
    long N; cin >> N;
    long x = 1, y = N;
    while(x < N and y > 0){
        if(x * x + y * y < N * N) x++;
        if(x * x + y * y > N * N) y--;
        if(x * x + y * y == N * N){
            x++;
            res++;
        }
    }
    cout << res << '\n';
}