#pragma GCC optimize ("Ofast")
#include<bits/stdc++.h>
using namespace std;
inline int my_getchar_unlocked(){
  static char buf[1048576];
  static int s = 1048576;
  static int e = 1048576;
  if(s == e && e == 1048576){
    e = fread_unlocked(buf, 1, 1048576, stdin);
    s = 0;
  }
  if(s == e){
    return EOF;
  }
  return buf[s++];
}
inline void rd(int &x){
  int k;
  int m=0;
  x=0;
  for(;;){
    k = my_getchar_unlocked();
    if(k=='-'){
      m=1;
      break;
    }
    if('0'<=k&&k<='9'){
      x=k-'0';
      break;
    }
  }
  for(;;){
    k = my_getchar_unlocked();
    if(k<'0'||k>'9'){
      break;
    }
    x=x*10+k-'0';
  }
  if(m){
    x=-x;
  }
}
struct MY_WRITER{
  char buf[1048576];
  int s;
  int e;
  MY_WRITER(){
    s = 0;
    e = 1048576;
  }
  ~MY_WRITER(){
    if(s){
      fwrite_unlocked(buf, 1, s, stdout);
    }
  }
}
;
MY_WRITER MY_WRITER_VAR;
void my_putchar_unlocked(int a){
  if(MY_WRITER_VAR.s == MY_WRITER_VAR.e){
    fwrite_unlocked(MY_WRITER_VAR.buf, 1, MY_WRITER_VAR.s, stdout);
    MY_WRITER_VAR.s = 0;
  }
  MY_WRITER_VAR.buf[MY_WRITER_VAR.s++] = a;
}
inline void wt_L(char a){
  my_putchar_unlocked(a);
}
inline void wt_L(int x){
  int s=0;
  int m=0;
  char f[10];
  if(x<0){
    m=1;
    x=-x;
  }
  while(x){
    f[s++]=x%10;
    x/=10;
  }
  if(!s){
    f[s++]=0;
  }
  if(m){
    my_putchar_unlocked('-');
  }
  while(s--){
    my_putchar_unlocked(f[s]+'0');
  }
}
template<class S> inline int arrEraseVal_L(S val1, int &sz, S a[]){
  int i;
  int n = sz;
  sz = 0;
  for(i=(0);i<(n);i++){
    if(a[i]!=val1){
      a[sz++] = a[i];
    }
  }
  return n - sz;
}
int N;
int X;
int A[100000];
int main(){
  rd(N);
  rd(X);
  {
    int Lj4PdHRW;
    for(Lj4PdHRW=(0);Lj4PdHRW<(N);Lj4PdHRW++){
      rd(A[Lj4PdHRW]);
    }
  }
  arrEraseVal_L(X, N, A);
  {
    int e98WHCEY;
    if(N==0){
      wt_L('\n');
    }
    else{
      for(e98WHCEY=(0);e98WHCEY<(N-1);e98WHCEY++){
        wt_L(A[e98WHCEY]);
        wt_L(' ');
      }
      wt_L(A[e98WHCEY]);
      wt_L('\n');
    }
  }
  return 0;
}
// cLay version 20210103-1 [bug fixed 2]

// --- original code ---
// int N, X, A[1d5];
// {
//   rd(N,X,A(N));
//   arrEraseVal(X, N, A);
//   wt(A(N));
// }

#include <bits/stdc++.h>
#define rep(i, n) for(int i = 0; i < (n); ++i)
#define rep1(i, n) for(int i = 1; i < (n); ++i)
using namespace std;
using ll = long long;

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    int n, x;
    cin >> n >> x;

    int a = 0;
    rep(i, n){
        int v, p;
        cin >> v >> p;
        a += v * p ;

        if(x*100 < a){
            cout << i+1 << endl;
            return 0;
        }
    }

    cout << -1 << endl;

    return 0;
}