#include<bits/stdc++.h>
using namespace std;
int main() {
	int k,m,n,a,b,ans=0;
	cin>>k>>m>>n;
	for(int i=1; i<=m; i++){
		cin>>a>>b;
		if(a==0&&b==0)continue;
		else if(k/a*b>=n||a==0&&b>0){
			cout<<i<<" ";
			ans++;
		}
	}
	if(ans==0)cout<<-1<<endl;
	return 0;
}