#include <iostream>
#include <fstream>
using namespace std;
ifstream f("energii.in");
ofstream g("energii.out");
int n,ok,v[100],s1[100],s2[100];
int main()
{
    int i,m,min;
    f>>n>>ok;
    for(i=1;i<=n;i++) f>>s1[i]>>s2[i];
    for(i=1;i<=n;i++)
    {
        if(ok%s1[i]==0)
        m=ok/s1[i];
        v[i]=m*s2[i];
    }
    min=v[1];
    for(i=2;i<=n;i++)
        if(min>v[i]) min=v[i];
    g<<min;
    f.close();
    g.close();
    return 0;
}