#include <iostream>
using namespace std;
bool b[105];
int main()
{
    int n,x;
    scanf("%d%d",&n,&x);
    while (n--)
    {
        int a;
        scanf("%d",&a);
        b[a]=1;
    }
    int ans=b[x];
    for (int i=0;i<x;i++)
    ans+=!b[i];
    printf("%d",ans);
}