#include <bits/stdc++.h>
#define TASK "ADVERT"
#define FAST ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
#define READFILE freopen(TASK".INP","r",stdin)
#define WRITEFILE freopen(TASK".OUT","w",stdout)
#define For(i,a,b) for(int i=a;i<=b;i++)
#define Rep(i,a,b) for(int i=a;i>=b;i--)
#define pb push_back
#define ENDL '\n'
#define debug(x) cout<<#x<<" = "<<x<<ENDL
#define fi first
#define se second
#define ever (;true;)
#define all(x) x.begin(),x.end()
#define sz(a) ((int)(a).size())
#define ms(a,x) memset(a,x,sizeof(a))
#define int long long

using namespace std;
typedef vector <int> vi;
typedef pair <int,int> ii;
typedef vector <ii> vpi;
typedef pair <int,ii> iii;
const int N = 100100;
const int oo=0x3f;
const int mod=1e9+7;
const int dx[]={0,1,0,-1,0};
const double ep=1e-4;
int x,y,n,b[N],a[N];
bool ok(double k){
    int w=x/k,h=y/k;
    int sumw=0;
    int sumh=0;
    if (a[1]>w) return 0;
    sumw=a[1];
    sumh=b[1];
    For(i,2,n){
        if (sumw+a[i]>w || b[i]!=b[i-1]){
            if (sumh+b[i]>h) return 0;
            sumw=a[i];
            sumh+=b[i];
        } else sumw+=a[i];
    }
}
void proc(){
    double l=0,r=1000000000;
    while (abs(r-l)>ep){
        double m=(l+r)/2;
        if (ok(m)) l=m;
        else r=m;
    }
    cout << setprecision(4) << fixed << l;
}
void init(){
  FAST;
  #ifndef ONLINE_JUDGE
    READFILE;
    WRITEFILE;
  #endif
  cin >> n >> x >> y;
  For(i,1,n) cin >> a[i] >> b[i];
}
signed main()
{
  init();
  proc();
  return 0;
}