import java.util.*;
import java.lang.*;
import java.io.*;
class f
{
{
// your code goes here
Scanner sc
=new Scanner
(System.
in);
int n,s;
n=sc.nextInt();
s=sc.nextInt();
int maxx=-1;
for(int i=0;i<n;i++)
{
int d,c;
d=sc.nextInt();
c=sc.nextInt();
if(100*d+c<=s*100 && (-100*d-c+s*100)%100>maxx)
maxx=(-100*d-c+s*100)%100;
}
}
}
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