#include <bits/stdc++.h>

using namespace std;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int a, b, c;
    cin >> a >> b >> c;
    vector<int> ans;
    if ((b + c) % a == 0) {
        ans.push_back((b + c) / a);
    }
    if (c % a == 0) {
        int x = c / a;
        if (a * x - b <= 0) {
            ans.push_back(x);
        }
    }
    sort(ans.begin(), ans.end());
    if (ans.size()) {
        for (auto x : ans) {
            cout << x << endl;
        }
    } else {
        cout << -1 << endl;
    }
}