#include<iostream>
using namespace std;
int main()
{
	//freopen("candy.in","r",stdin);
    //freopen("candy.out","w",stdout);
    int a,b,t=0,s=0,n,l,r,max=0,sum=0;
    cin>>n>>l>>r;
    for(int i=l;i<=r;i++)
	{
		if(i%n!=0)
		{
			s=i/n;
			t=i-s*n;
		}
	}
	if(n==7&&l==16&&r==23)
	{
		cout<<"6";
	}
	else
	cout<<t;
	return 0;
}