#include"testlib.h"
#include<iostream>
#include<vector>
#include<string>
#include<map>
#include<set>
#include<queue>
#include<algorithm>
#include<cmath>
#include<iomanip>
#include<random>
#include<stdio.h>
using namespace std;

typedef long long ll;
const long long MIN_N = 2;
const long long MAX_N = 5000;
const long long MIN_M = 1;
const long long MAX_M = 5000;
const long long MIN_a = 0;
const long long MAX_a = 1000000000;

void validate(){
  long long N = inf.readLong(MIN_N,MAX_N);
  inf.readSpace();
  long long M = inf.readLong(1,N);
  inf.readEoln();

  set<ll> P;
  long long p;
  for (long long i=0;i<N;i++){
    p = inf.readLong(1,N);

    if (p==i+1){
      inf.readEof();
    }

    if (P.find(p)!=P.end()){
      inf.readEof();
    }
    else{
      P.insert(p);
    }

    if (i!=N-1){
      inf.readSpace();
    }
    else{
      inf.readEoln();
    }
  }
  inf.readEof();
}

int main(int argc, char* argv[]){
  registerValidation(argc,argv);
  validate();
}