#include <fstream>

using namespace std;
ifstream f("cautbin.in");
ofstream g("cautbin.out");

int v[1005];
int f(int v[],int n,int x){
    int m,is=0,gasit=-1;
    int iend=n;
        while(is<=iend&&gasit==-1){

            m=(iend-is)/2;
                if(v[m]==x) {gasit=m;}
                else
                    if(x<v[m]){
                        is=0;
                        iend=m-1;

                      }
                    else{
                        is=m+1;
                        iend=n;
                    }

        }

        while(v[gasit+1]==v[gasit]) gasit++;

        return gasit;
}

int main()
{
    int n,x;
    f>>n>>x;


    for(int i=1;i<=n;i++)cin>>v[i];
    g<<f(v,n,x);
    return 0;
}