#include <iostream>
#include <fstream>
using namespace std;
ifstream f("energii.in");
ofstream g("energii.out");
int main()
{   float r;
    int x,y,a,b,t=32000;
    f>>x>>y;
    while(x)
    {
        f>>a>>b;
        r=y/a;
        if(t>r*b) t=r*b;
        x--;
    }
    g<<t;
    return 0;
}