#pragma GCC optimize(1)
#pragma GCC optimize(2)
#pragma GCC optimzie(3,"Pfast","inline")
#include<iostream>
using namespace std;
int main()
{
	long long n,L,R;
	long long x;
	cin>>n>>L>>R;
	x=L;
	for(int i=L+1;i<=R;i++)
	{
		if(i%n>x%n) x=i;
	}
	cout<<x%n<<endl;
	return 0;
}