#include<bits/stdc++.h>
using namespace std;
const int N=50010;
typedef long long LL;
struct Node{
    LL sum,w,s;
    bool operator<(const Node& W)const
    {
        return sum<W.sum;
    }
}cow[N];
int main()
{
    int n;
    cin>>n;
    n++;
    for(int i=0;i<n;i++)
    {
        cin>>cow[i].w>>cow[i].s;
        cow[i].sum=cow[i].w*cow[i].s;
    }
    sort(cow,cow+n);
    LL res=-2e18;
    LL ss=1;
    for(int i=1;i<n;i++)
    {
    //    cout<<cow[i].w<<" "<<cow[i].s<<endl;
        res=max(res,ss/cow[i].s);
        ss*=cow[i].w;
    }
    cout<<res;
    return 0;
}