#include <bits/stdc++.h>
using namespace std;
bool z;
long long k,m,n,a[30000005],b[30000005];
int main()
{
	cin>>k>>m>>n;
	for(long long i=1;i<=m;i++)   cin>>a[i]>>b[i];
	for(long long i=1;i<=m;i++)	if(a[i]<=k)
			if(k/a[i]*b[i]>=n)
			{
				cout<<i<<" ";
				z=1;
			}
	if(z==0)    cout<<-1;
	return 0;
}