ac

#include <iostream>
#include <cstdio>
//#include <cmath>
//#include <cstring>
using namespace std;

int main(){
	unsigned int n,l,r,k,ans=0;
	scanf("%d%d%d",&n,&l,&r);//n<=l<=拿糖数<=r
	//cin>>n>>l>>r;
	
	if (r/n>l/n) {
		printf("%d",n-1);
		return 0;
	}
	else {
		printf("%d",r%n);
	}/*
	for (k=l;k<=r;k++){
		ans=max(ans,k%n);
	}
	printf("%d",ans);*/
	//cout<<ans;
	return 0;
}