#include <bits/stdc++.h>
using namespace std;
#define int long long int
int32_t main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int l,n;
cin>>l>>n;
//int arr[n];
int ans=0;
int x;
cin>>x;
int a;
cin>>a;
vector<int>arr(l,0);
for(int i=0;i<a;i++)
{
arr[i]++;
}
for(int i=l-a;i<l;i++)
{
arr[i]++;
}
for(int i=0;i<l;i++)
{
if(arr[i]==2)
ans++;
}
cout<<ans<<endl;
return 0;
}
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