#include <bits/stdc++.h>

using namespace std;

int main() {
    ios::sync_with_stdio(false); //读入输出优化的强迫症
    int k, m, n, f, s, i, fl = 1;
    cin >> k >> m >> n;
    for (i = 1; i <= m; i++) {
        cin >> f >> s;
        if (f == 0 || k / f * s >= n) {
            fl = 0;
            cout << i << ' ';
        }
    }
    if (fl) cout << -1;
}