#include<bits/stdc++.h> using namespace std; int n,l,r; int main(){ cin>>n>>l>>r; if(r/n==l/n) cout<<r%n<<endl; else cout<<n-1<<endl; return 0; }

#include<bits/stdc++.h>
using namespace std;
int n,l,r;
int main(){
    cin>>n>>l>>r;
    if(r/n==l/n)
        cout<<r%n<<endl;
    else
        cout<<n-1<<endl;
    return 0;
}