#include<iostream>
#include<algorithm>
#include<cstring>
#include<map>
#include<set>
#include<queue>
#include<cmath>
using namespace std;

int main(){
	int ans=-1;
	int n;
	int s;
	cin>>n>>s;
	int ans1=-1;
	for(int i=0;i<n;++i){
		int t1,t2;
		cin>>t1>>t2;
		if(s>t1 & t2>0 && ans<100-t2)ans=100-t2,ans1=t2;
		if(s==t1 && t2==0&& ans==-1)ans=0,ans1=0;
	}
	cout<<ans1;
	//system("pause");
}