#include<iostream>
using namespace std;
int arr[100005][2];
int n,k;
bool judge(int m){
	int count=0;
	for(int i=0;i<n;i++){
		count+=((arr[i][0]/m)*(arr[i][1]/m));
		if(count>=k){
			return true;
		}
	}
	return false;
}
int main(){
	int MAX=0,MIN=1;
	cin>>n>>k;
	for(int i=0;i<n;i++){
		cin>>arr[i][0]>>arr[i][1];
		if(arr[i][0]>MAX){
			MAX=arr[i][0];
		}
		if(arr[i][1]>MAX){
			MAX=arr[i][1];
		}
	}
	MAX++;	
	while(MAX-MIN>1){
		cout<<"MAX"<<MAX<<"MIN"<<MIN<<endl;
		int MID=(MAX+MIN)/2;
		if(judge(MID)){
			MIN=MID;
		}else{
			MAX=MID;
		}
		cout<<"+-----MAX"<<MAX<<"MIN"<<MIN<<endl;
	}
	cout<<MIN;
	return 0;
}