https://www.acmicpc.net/problem/16204
import 'dart:io';
import 'dart:math';
void main(){
String? s=stdin.readLineSync();
final v=s!.split(' ').map<int>((o)=>int.parse(o));
var n=v.elementAt(0);
var m=v.elementAt(1);
var k=v.elementAt(2);
print(min(m,k)+min(n-m,n-k));
}