#include<bits/stdc++.h>
using namespace std;
struct jini{
	int lantiao, shanghai;
}a[5000001];
int main(){
	int n, m, x, f = 1;
	cin>>n>>m>>x;
	for(int i = 1;i <= m;i++){
		cin>>a[i].lantiao>>a[i].shanghai;
	}
	for(int i = 1;i <= m;i++){
		if(a[i].lantiao != 0){
			if(n / a[i].lantiao * a[i].shanghai >= x && n > a[i].lantiao){
				cout << i << " " ;
				f = 0;
			} 
		} else {
			if(a[i].shanghai != 0) cout << i << " " ;
			f = 0;
		}
	}
	if(f) cout<< -1 ;
	return 0;
}