#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, s, e) for (int i = (int)(s); i < (int)(e); ++i)

int main() {
	cin.tie(nullptr);
	ios_base::sync_with_stdio(false);
	
	ll A, B, C;
	cin >> A >> B >> C;
	
	if (A < 0) {
		A *= -1;
		B *= -1;
		C *= -1;
	}
	
	int ans = 0;
	for (ll x = -1000010; x <= 1000010; ++x) {
		if (A*x*x + B*x + C < 0) ++ans;
	}
	cout << ans << '\n';
}