#include <iostream>
#include <cstdio>
using namespace std;
typedef long long ll;
//const ll size=100005;
ll n,L,R;
ll num,m,ji;
int main()
{
	//freopen("candy.in","r",stdin);
	//freopen("candy.out","w",stdout);
	cin>>n>>L>>R;
	num=R/n;
	m=R%n;
	ji=n*num;
	if(L=R)
	{
		cout<<m;
		return 0;
	}
	if(ji>L)
	{
		cout<<(ji-1)%n;
	}
	if(ji<=L)
	{
		cout<<m;
	}
	return 0;
}