862A - Mahmoud and Ehab and the MEX - CodeForces Solution

#define _CRT_SECURE_NO_WARNINGS
#include<bits/stdc++.h>
#define ff first
#define ss second
#define pi 3.141592654
#define ll long long 
#define all(v)  ((v).begin()) , ((v).end())
#define cy cout<<"YES\n";
#define cn cout<<"NO\n";
#define pb push_back 
#define rbe(i,a,b) for(int i=a ; i<b ;i++) 
using namespace std;
 void can() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr), cout.tie(nullptr);
}


int main(){
//وَأَنْ لَيْسَ لِلْإِنْسَانِ إِلَّا مَا سَعَى
ios::sync_with_stdio(0);
cin.tie(0);
can();
 int n,x;
 cin>>n>>x;
    int ctr=0;
    bool f=0;
 for(int i=0;i<n;i++){
    int z;cin>>z;
    if(z==x)
        f=1;
    if(z<x)
     ctr++;
 }
 
    cout<<abs(x-ctr)+f<<endl;
return 0 ;
}