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#include<bits/stdc++.h>
using namespace std;
int g,w,a[10000],b[10000],c[10000];
int main(){
ifstream cin("energii.in");
ofstream cout("energii.out");
cin>>g>>w;
for(int i=1;i<=g;i++){
cin>>a[i];
cin>>b[i];
if(a[i]%2==0) c[i]=(w/a[i])*b[i];
}
sort(c+1,c+g+1);
if(c[1]==0) cout<<"-1";
else cout<<c[1];
return 0;
}