#include <iostream>
#include <fstream>
using namespace std;

int main()
{
    ifstream A("energii.in");
    ofstream B("energii.out");
    int G,W,C=0,EG,CG;
    A>>G>>W;
    for(int i=1;i<=G;++i)
    {
        A>>EG>>CG;
        EG=(W*CG)/CG;
        if(EG>=C)
            C=CG;
    }

        B<<C;

    A.close();
    B.close();
    return 0;
}