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#include<bits/stdc++.h>
using namespace std;
int main(){
    freopen("candy.in","r",stdin);freopen("candy.out","w",stdout);
    unsigned int n,l,r,k;
    cin>>n;
    k=n-1;

    cin>>l>>r;
    cout<<(r-l>=n||r/n!=l/n?k:r%n);
    fclose(stdin);fclose(stdout);
}