#include<bits/stdc++.h>
using namespace std;
int main(){
	freopen("candy.in","r",stdin);freopen("candy.out","w",stdout);
	unsigned int n,l,r,k;
	cin>>n;
	k=n-1;
    
	cin>>l>>r;
	cout<<(r-l>=n||r/n!=l/n?k:r%n);
	fclose(stdin);fclose(stdout);
}