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

int main(){
    ll a, b, c;
    cin >> a >> b >> c;
    long double D = sqrtl(b * b - 4 * a * c);
    ll d = D;
    if(d * d == b * b - 4 * a * c){
        ll L = -b - d;
        ll R = -b + d;
        if(a < 0) L *= -1, R *= -1;
        a = abs(a);
        if(L > R) swap(L, R);
        if(R % (2 * a) == 0) R = R / (a * 2) - 1;
        else if(R > 0) R /= 2 * a;
        else R = R / (2 * a) - 1;
        if(L % (2 * a) == 0) L = L / (a * 2) + 1;
        else if(L > 0) L = L / (2 * a) + 1;
        else L = L / (2 * a);
        cout << max(0ll, R - L + 1) << '\n';
    }else{
        long double L = (long double)(-b - D) / (2 * a);
        long double R = (long double)(-b + D) / (2 * a);
        if (L > R) swap(L, R);
        cout << floor(R) - ceil(L) + 1 << '\n';
    }
}