#include<bits/stdc++.h>
using namespace std;
int main()
{
	freopen("candy.in","r",stdin);
	freopen("candy.out","w",stdout);
	std::ios::sync_with_stdio(false);
	long long n,l,r;cin>>n>>l>>r;
	if(l-r>n)
	{
		cout<<n-1<<endl;
		return 0;
	}
	if(l==r)
	{
		cout<<l%n<<endl;
		return 0;
	}
	int p=r/n;
	if(p>1)
	{
		cout<<n-1<<endl;
		return 0;
	}
	else
	{
		cout<<r-n<<endl;
		return 0;
	}
	return 0;
}