#include <bits/stdc++.h>
using namespace std;
int main () {
	using ll = long long;
	ll a, b, c;
	cin >> a >> b >> c;
	if (a < 0) {
		a *= -1;
		b *= -1;
		c *= -1;
	}
	ll D = (ll)7e6;
	ll ans =0;
	for (ll x = -D; x <= D; x ++) {
		ans += (a * x * x + b * x + c < 0);
	}
	cout << ans << endl;
}