#include "bits/stdc++.h"
using namespace std;
int main(){
    int n,l,r;
    scanf("%d%d%d",&n,&l,&r);
    if(r-l>=n) printf("%d",n-1);
    else{
        int a=l%n;
        int b=r%n;
        if(b<a) printf("%d",n-1);
        else printf("%d",b);
    }
    return 0;}
/**************************************************************
	Problem: 2401
	User: fzy001
	Language: C++
	Result: Accepted
	Time:46 ms
	Memory:2076 kb
****************************************************************/