#include <iostream>  
#include<vector> 
using namespace std; 
#define i long long

int main() {  
    i n,l,r;
    cin>>n>>l>>r;
    if(r%n==0){
		if(r==l||r-1==l){
			i k=l;
			cout<<k%n;
		}
		else {
			i k=r-1;
			cout<<k%n;
		}	
	}
	else if(r%n!=0){
		cout<<n-1;
	}
	
}