#include <stdio.h>

int main(){
  long int a,x,y,p,q,o=0,i,j,b[100001],c[100001];
  scanf("%ld%ld%ld",&x,&a,&y);
  for(i=1;i<=a;i++)
  {
      scanf("%ld%ld",&b[i],&c[i]);
  }
  for(j=1;j<=a;j++)
  {if(b[j]!=0)
     {
      p=x/b[j];
      q=p*c[j];
      if(q>=y) {printf("%ld ",j); o=1;}
     } 
  }
  if(o==0) {printf("-1");}
    return 0;
  }