#include<iostream>
using namespace std;

int main()
{
    int a,b,c,d;
    int n=0;
    
    cin>>a;
    cin>>b;
    cin>>c;
    cin>>d;
    
    n=b/c;
    
    if(n>a)
    {
        cout<<a;
    }
    else
    {
        cout<<n;
    }
    
    return 0;
}