#include <iostream>
using namespace std;
long long n,m,k;//n为法力值，m为技能总量，k为boos体力值就是血量
int shanghai[100];
int gongji[100];
int main()
{
    bool s=0;
    cin>>k>>m>>n;
    long long a;
    long long b;
    for(int i=1;i<=m;i++){
        cin>>a;//被造成伤害
        cin>>b;//对别人伤害
        if(a==0){
            cout<<i<<" ";
            s=1;
            continue;
        }
        //else if(a>=n){
          //  continue;
        //}
        else{
            int keshiyong=n/a;
            if(k-n*keshiyong<=0){
                cout<<i<<" ";
                s=1;
                //continue;
            }
        }
    }
    if(s==0){
        cout<<"-1";
    }
    return 0;
}