#include<bits/stdc++.h>
using namespace std;
int n,l,r;
int sn,maxn;
int main()
{
    freopen("candy.in","r",stdin);
    freopen("candy.out","w",stdout);
    scanf("%d %d %d",&n,&l,&r);
    for(int i=l;i<=r;++i)
    {
        sn=i%n;
        if(sn==(n-1))
        {
            printf("%d",sn);
            cout<<endl;
            return 0;
        }
        if(sn>maxn)
            maxn=sn;
    }
    printf("%d",sn);
    fclose(stdin);
    fclose(stdout);
    return 0;
}