代码：

#include<iostream>
#include<cstdio>
using namespace std;
int n, L, R, flag;
int main()
{
//	freopen("candy.in", "r", stdin);
//	freopen("candy.out", "w", stdout);
	cin >> n >> L >> R;
	if(L == R)
		flag = 1;
	L %= n;
	R %= n;
	if(R < L)
		cout << n - 1;
	else if(R > L) 
		cout << R;
	else if(flag == 1)
		cout << R;
	else
		cout << n - 1;
//	fclose(stdin);
//	fclose(stdout);
	return 0;
}