#include<bits/stdc++.h>
using namespace std;
int main(){
	/*
    freopen("filename.in","r",stdin);
    freopen("filename.out","w",stdout);
    */
	int n,l,r,m[10000000],b1=0,b2=0;
    cin>>n>>l>>r;
    for(int i=l;i<=r;i++){
    	while(i>=n){
    		i-=n;
		}
		m[i]=i;
	}
	for(int i=0;i<=r;i++){
		if(m[i]>b1){
			b1=m[i];
		}
	}
	cout<<b1;
    return 0;
}