#include<stdio.h>

int c[30001],t[30001];

int main(){
    freopen("secv3.in","r",stdin);
    freopen("secv3.out","w",stdout);
    int i,n,l,u;
    float x,max=-1;
    scanf("%d%d%d",&n,&l,&u);
    for(i=1;i<=n;i++)
      scanf("%d",&c[i]);
    for(i=1;i<=n;i++)
      scanf("%d",&t[i]);
    for(i=1;i<=n;i++)
      if((x=(float)c[i]/t[i])>max)
        max=x;
    printf("%.2f",max);
    return 0;
}