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#include <bits/stdc++.h>
#define lld long long int

using namespace std;
lld N,P,licz;
int main()
{
	scanf("%lld",&N);
 //P = (lld)pow( N, (double)1/3 );
	for(lld i = 1;i<=N;++i)
	{
		lld pom = i*2;
		//cout << i << ": " << endl;
		while(pom<=N)
		{
			lld x = N-(i+pom);
			if(x<pom)
			{
				break;
			}
			if(x>pom and x%pom == 0)
			{
				++licz;	
//				cout << " DZIALA " << endl;f
			}
			pom+=i;
		}
	}
	printf("%lld",licz);
}