/*
TASK:sum
LANG:C++
*/

#include <iostream>
#include <cmath>
using namespace std;

long long n,br; 

int main()
{
	cin>>n;
	long long a,k;
    for(long long i=1;i<=n/2;i++)
    {
		a=4*i*i-4*i+1+8*n;
		k=sqrt(a);
		if(k*k==a) br++;
    }
    cout<<br<<endl;
    return 0;
}
